M3t0r__tpl-12

diff --git a/tpl/__init__.py b/tpl/__init__.py
index 96b6c41..afe310e 100644
--- a/tpl/__init__.py
+++ b/tpl/__init__.py
@@ -63,13 +63,13 @@ def main(*args):
 
     # create template
     with open_file(arguments[0]) as template_stream:
-        template = jinja2.Template(template_stream.read())
+        env = jinja2.Environment(keep_trailing_newline=True)
+        template = env.from_string(template_stream.read())
         template.filename = arguments[0]
 
     # and render to output
     with open_file(arguments[1], "w") as output:
         template.stream(collated_data).dump(output)
-        output.write("\n")  # does the template eat this or the dump call?
 
     return os.EX_OK
 

============================= test session starts ==============================
collected 25 items

tests/cli/test_faulty_invocations.py ...                                 [ 12%]
tests/cli/test_help_and_usage.py .....                                   [ 32%]
tests/cli/test_standard_usecases.py ................                     [ 96%]
tests/test_interface.py .                                                [100%]

==================================== PASSES ====================================
___________________________ test_key_does_not_exist ____________________________
----------------------------- Captured stdout call -----------------------------
Command: ['tpl', '/tmp/pytest-of-root/pytest-0/test_key_does_not_exist0/FOO-0']
Return code: 0
STDOUT: (stream is empty)
------------------------
========================
STDERR: (stream is empty)
------------------------
========================
Folder hierarchy:
./
|-- FOO-0
______________________________ test_corrupt_yaml _______________________________
----------------------------- Captured stdout call -----------------------------
Command: ['tpl', '--yaml', '/tmp/pytest-of-root/pytest-0/test_corrupt_yaml0/FOOnotproperlyclosed-0', '/tmp/pytest-of-root/pytest-0/test_corrupt_yaml0/FOO-0']
Return code: 1
STDOUT: (stream is empty)
------------------------
========================
STDERR:
------------------------
Traceback (most recent call last):
  File "/usr/local/bin/tpl", line 7, in <module>
    sys.exit(_argv_wrapper())
  File "/testbed/tpl/__main__.py", line 8, in _argv_wrapper
    return main(*sys.argv)
  File "/testbed/tpl/__init__.py", line 50, in main
    loaded_data = [parse_input_options(*o) for o in options]
  File "/testbed/tpl/__init__.py", line 50, in <listcomp>
    loaded_data = [parse_input_options(*o) for o in options]
  File "/testbed/tpl/__init__.py", line 163, in parse_input_options
    return parsers[type](open_file(file))
  File "/testbed/tpl/__init__.py", line 174, in load_yaml_stream
    return yaml.safe_load(stream)
  File "/usr/local/lib/python3.10/site-packages/yaml/__init__.py", line 125, in safe_load
    return load(stream, SafeLoader)
  File "/usr/local/lib/python3.10/site-packages/yaml/__init__.py", line 81, in load
    return loader.get_single_data()
  File "/usr/local/lib/python3.10/site-packages/yaml/constructor.py", line 49, in get_single_data
    node = self.get_single_node()
  File "/usr/local/lib/python3.10/site-packages/yaml/composer.py", line 35, in get_single_node
    if not self.check_event(StreamEndEvent):
  File "/usr/local/lib/python3.10/site-packages/yaml/parser.py", line 98, in check_event
    self.current_event = self.state()
  File "/usr/local/lib/python3.10/site-packages/yaml/parser.py", line 142, in parse_implicit_document_start
    if not self.check_token(DirectiveToken, DocumentStartToken,
  File "/usr/local/lib/python3.10/site-packages/yaml/scanner.py", line 116, in check_token
    self.fetch_more_tokens()
  File "/usr/local/lib/python3.10/site-packages/yaml/scanner.py", line 251, in fetch_more_tokens
    return self.fetch_double()
  File "/usr/local/lib/python3.10/site-packages/yaml/scanner.py", line 655, in fetch_double
    self.fetch_flow_scalar(style='"')
  File "/usr/local/lib/python3.10/site-packages/yaml/scanner.py", line 666, in fetch_flow_scalar
    self.tokens.append(self.scan_flow_scalar(style))
  File "/usr/local/lib/python3.10/site-packages/yaml/scanner.py", line 1151, in scan_flow_scalar
    chunks.extend(self.scan_flow_scalar_spaces(double, start_mark))
  File "/usr/local/lib/python3.10/site-packages/yaml/scanner.py", line 1238, in scan_flow_scalar_spaces
    raise ScannerError("while scanning a quoted scalar", start_mark,
yaml.scanner.ScannerError: while scanning a quoted scalar
  in "/tmp/pytest-of-root/pytest-0/test_corrupt_yaml0/FOOnotproperlyclosed-0", line 1, column 9
found unexpected end of stream
  in "/tmp/pytest-of-root/pytest-0/test_corrupt_yaml0/FOOnotproperlyclosed-0", line 1, column 29
========================
Folder hierarchy:
./
|-- FOO-0
|-- FOOnotproperlyclosed-0
______________________________ test_corrupt_json _______________________________
----------------------------- Captured stdout call -----------------------------
Command: ['tpl', '--json', '/tmp/pytest-of-root/pytest-0/test_corrupt_json0/FOOnotproperlyclosed-0', '/tmp/pytest-of-root/pytest-0/test_corrupt_json0/FOO-0']
Return code: 1
STDOUT: (stream is empty)
------------------------
========================
STDERR:
------------------------
Traceback (most recent call last):
  File "/usr/local/bin/tpl", line 7, in <module>
    sys.exit(_argv_wrapper())
  File "/testbed/tpl/__main__.py", line 8, in _argv_wrapper
    return main(*sys.argv)
  File "/testbed/tpl/__init__.py", line 50, in main
    loaded_data = [parse_input_options(*o) for o in options]
  File "/testbed/tpl/__init__.py", line 50, in <listcomp>
    loaded_data = [parse_input_options(*o) for o in options]
  File "/testbed/tpl/__init__.py", line 163, in parse_input_options
    return parsers[type](open_file(file))
  File "/testbed/tpl/__init__.py", line 179, in load_json_stream
    return json.load(stream)
  File "/usr/local/lib/python3.10/json/__init__.py", line 293, in load
    return loads(fp.read(),
  File "/usr/local/lib/python3.10/json/__init__.py", line 346, in loads
    return _default_decoder.decode(s)
  File "/usr/local/lib/python3.10/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/local/lib/python3.10/json/decoder.py", line 353, in raw_decode
    obj, end = self.scan_once(s, idx)
json.decoder.JSONDecodeError: Unterminated string starting at: line 1 column 9 (char 8)
========================
Folder hierarchy:
./
|-- FOO-0
|-- FOOnotproperlyclosed-0
____________________ test_usage_and_error_without_arguments ____________________
----------------------------- Captured stdout call -----------------------------
Command: ['tpl']
Return code: 64
STDOUT: (stream is empty)
------------------------
========================
STDERR:
------------------------
No template file was specified.
Usage:
  tpl [options] <template_file>
  tpl --help
  tpl --version
========================
Folder hierarchy:
./

________________________________ test_help_on_h ________________________________
----------------------------- Captured stdout call -----------------------------
Command: ['tpl', '-h']
Return code: 0
STDOUT: (stream is empty)
------------------------
========================
STDERR:
------------------------
Usage:
  tpl [options] <template_file>
  tpl --help
  tpl --version


tpl uses the Jinja2 templating engine to render it's output. You can find the
documentation for template designers at:
    http://jinja.pocoo.org/docs/3.1.6/templates/

If you provide multiple data sources they will be merged together. If a key is
present in more than one source the value of the source that was specified
last will be used.

Options:
  -e, --environment    Use all environment variables as data
  --json=<file>        Load JSON data from a file or STDIN
  --yaml=<file>        Load YAML data from a file or STDIN
========================
Folder hierarchy:
./

______________________________ test_help_on_help _______________________________
----------------------------- Captured stdout call -----------------------------
Command: ['tpl', '--help']
Return code: 0
STDOUT: (stream is empty)
------------------------
========================
STDERR:
------------------------
Usage:
  tpl [options] <template_file>
  tpl --help
  tpl --version


tpl uses the Jinja2 templating engine to render it's output. You can find the
documentation for template designers at:
    http://jinja.pocoo.org/docs/3.1.6/templates/

If you provide multiple data sources they will be merged together. If a key is
present in more than one source the value of the source that was specified
last will be used.

Options:
  -e, --environment    Use all environment variables as data
  --json=<file>        Load JSON data from a file or STDIN
  --yaml=<file>        Load YAML data from a file or STDIN
========================
Folder hierarchy:
./

______________________________ test_version_on_v _______________________________
----------------------------- Captured stdout call -----------------------------
Command: ['tpl', '-v']
Return code: 0
STDOUT:
------------------------
tpl - 0.7+18.gb534fa5
========================
STDERR: (stream is empty)
------------------------
========================
Folder hierarchy:
./

___________________________ test_version_on_version ____________________________
----------------------------- Captured stdout call -----------------------------
Command: ['tpl', '--version']
Return code: 0
STDOUT:
------------------------
tpl - 0.7+18.gb534fa5
========================
STDERR: (stream is empty)
------------------------
========================
Folder hierarchy:
./

___________________________ test_source_environment ____________________________
----------------------------- Captured stdout call -----------------------------
Command: ['tpl', '-e', '/tmp/pytest-of-root/pytest-0/test_source_environment0/FOO-0']
Return code: 0
STDOUT: (does not end in newline
------------------------
bar
========================
STDERR: (stream is empty)
------------------------
========================
Folder hierarchy:
./
|-- FOO-0
_______________________________ test_unicode_var _______________________________
----------------------------- Captured stdout call -----------------------------
Command: ['tpl', '-e', '/tmp/pytest-of-root/pytest-0/test_unicode_var0/FOO-0']
Return code: 0
STDOUT: (does not end in newline
------------------------
🐍
========================
STDERR: (stream is empty)
------------------------
========================
Folder hierarchy:
./
|-- FOO-0
___________________________ test_shadowing_json_env ____________________________
----------------------------- Captured stdout call -----------------------------
Command: ['tpl', '--json', '/tmp/pytest-of-root/pytest-0/test_shadowing_json_env0/json-data-0', '-e', '/tmp/pytest-of-root/pytest-0/test_shadowing_json_env0/FOO-0']
Return code: 0
STDOUT: (does not end in newline
------------------------
env
========================
STDERR: (stream is empty)
------------------------
========================
Folder hierarchy:
./
|-- FOO-0
|-- json-data-0
___________________________ test_shadowing_yaml_env ____________________________
----------------------------- Captured stdout call -----------------------------
Command: ['tpl', '--yaml', '/tmp/pytest-of-root/pytest-0/test_shadowing_yaml_env0/yaml-data-0', '-e', '/tmp/pytest-of-root/pytest-0/test_shadowing_yaml_env0/FOO-0']
Return code: 0
STDOUT: (does not end in newline
------------------------
env
========================
STDERR: (stream is empty)
------------------------
========================
Folder hierarchy:
./
|-- yaml-data-0
|-- FOO-0
_____________________________ test_yaml_flow_style _____________________________
----------------------------- Captured stdout call -----------------------------
Command: ['tpl', '--yaml', '/tmp/pytest-of-root/pytest-0/test_yaml_flow_style0/FOOyaml-0', '/tmp/pytest-of-root/pytest-0/test_yaml_flow_style0/FOO-0']
Return code: 0
STDOUT: (does not end in newline
------------------------
yaml
========================
STDERR: (stream is empty)
------------------------
========================
Folder hierarchy:
./
|-- FOO-0
|-- FOOyaml-0
_________________________ test_environment_by_default __________________________
----------------------------- Captured stdout call -----------------------------
Command: ['tpl', '/tmp/pytest-of-root/pytest-0/test_environment_by_default0/FOO-0']
Return code: 0
STDOUT: (does not end in newline
------------------------
bar
========================
STDERR: (stream is empty)
------------------------
========================
Folder hierarchy:
./
|-- FOO-0
___________________________ test_sub_dict_shadowing ____________________________
----------------------------- Captured stdout call -----------------------------
Command: ['tpl', '--json', '/tmp/pytest-of-root/pytest-0/test_sub_dict_shadowing0/json-data-0', '--json', '/tmp/pytest-of-root/pytest-0/test_sub_dict_shadowing0/json-data-1', '/tmp/pytest-of-root/pytest-0/test_sub_dict_shadowing0/FOOBAR-0']
Return code: 0
STDOUT: (does not end in newline
------------------------
second
========================
STDERR: (stream is empty)
------------------------
========================
Folder hierarchy:
./
|-- json-data-1
|-- FOOBAR-0
|-- json-data-0
____________________________ test_sub_dict_merging _____________________________
----------------------------- Captured stdout call -----------------------------
Command: ['tpl', '--json', '/tmp/pytest-of-root/pytest-0/test_sub_dict_merging0/json-data-0', '--json', '/tmp/pytest-of-root/pytest-0/test_sub_dict_merging0/json-data-1', '/tmp/pytest-of-root/pytest-0/test_sub_dict_merging0/mergeFOOmergeBAR-0']
Return code: 0
STDOUT: (does not end in newline
------------------------
foobar
========================
STDERR: (stream is empty)
------------------------
========================
Folder hierarchy:
./
|-- json-data-1
|-- mergeFOOmergeBAR-0
|-- json-data-0
________________________ test_second_sub_dict_shadowing ________________________
----------------------------- Captured stdout call -----------------------------
Command: ['tpl', '--json', '/tmp/pytest-of-root/pytest-0/test_second_sub_dict_shadowing0/json-data-0', '--json', '/tmp/pytest-of-root/pytest-0/test_second_sub_dict_shadowing0/json-data-1', '/tmp/pytest-of-root/pytest-0/test_second_sub_dict_shadowing0/merge.deeper.overwritten-0']
Return code: 0
STDOUT: (does not end in newline
------------------------
bar
========================
STDERR: (stream is empty)
------------------------
========================
Folder hierarchy:
./
|-- merge.deeper.overwritten-0
|-- json-data-1
|-- json-data-0
_________________________ test_second_sub_dict_merging _________________________
----------------------------- Captured stdout call -----------------------------
Command: ['tpl', '--json', '/tmp/pytest-of-root/pytest-0/test_second_sub_dict_merging0/json-data-0', '--json', '/tmp/pytest-of-root/pytest-0/test_second_sub_dict_merging0/json-data-1', '/tmp/pytest-of-root/pytest-0/test_second_sub_dict_merging0/merge.deeper.FOOmerge.deeper.BAR-0']
Return code: 0
STDOUT: (does not end in newline
------------------------
foobar
========================
STDERR: (stream is empty)
------------------------
========================
Folder hierarchy:
./
|-- json-data-1
|-- json-data-0
|-- merge.deeper.FOOmerge.deeper.BAR-0
____________________________ test_shadowing_of_dict ____________________________
----------------------------- Captured stdout call -----------------------------
Command: ['tpl', '--json', '/tmp/pytest-of-root/pytest-0/test_shadowing_of_dict0/json-data-0', '--json', '/tmp/pytest-of-root/pytest-0/test_shadowing_of_dict0/json-data-1', '/tmp/pytest-of-root/pytest-0/test_shadowing_of_dict0/merge-0']
Return code: 0
STDOUT: (does not end in newline
------------------------
bar
========================
STDERR: (stream is empty)
------------------------
========================
Folder hierarchy:
./
|-- merge-0
|-- json-data-1
|-- json-data-0
_________________________ test_keep_no_newline_at_end __________________________
----------------------------- Captured stdout call -----------------------------
Command: ['tpl', '/tmp/pytest-of-root/pytest-0/test_keep_no_newline_at_end0/FOO-0']
Return code: 0
STDOUT: (does not end in newline
------------------------
bar
========================
STDERR: (stream is empty)
------------------------
========================
Folder hierarchy:
./
|-- FOO-0
_________________________ test_keep_one_newline_at_end _________________________
----------------------------- Captured stdout call -----------------------------
Command: ['tpl', '/tmp/pytest-of-root/pytest-0/test_keep_one_newline_at_end0/FOO-0']
Return code: 0
STDOUT:
------------------------
bar
========================
STDERR: (stream is empty)
------------------------
========================
Folder hierarchy:
./
|-- FOO-0
________________________ test_keep_two_newlines_at_end _________________________
----------------------------- Captured stdout call -----------------------------
Command: ['tpl', '/tmp/pytest-of-root/pytest-0/test_keep_two_newlines_at_end0/FOO-0']
Return code: 0
STDOUT:
------------------------
bar

========================
STDERR: (stream is empty)
------------------------
========================
Folder hierarchy:
./
|-- FOO-0
______________________ test_keep_one_newline_at_beginning ______________________
----------------------------- Captured stdout call -----------------------------
Command: ['tpl', '/tmp/pytest-of-root/pytest-0/test_keep_one_newline_at_begin0/FOO-0']
Return code: 0
STDOUT: (does not end in newline
------------------------

bar
========================
STDERR: (stream is empty)
------------------------
========================
Folder hierarchy:
./
|-- FOO-0
_____________________ test_keep_two_newlines_at_beginning ______________________
----------------------------- Captured stdout call -----------------------------
Command: ['tpl', '/tmp/pytest-of-root/pytest-0/test_keep_two_newlines_at_begi0/FOO-0']
Return code: 0
STDOUT: (does not end in newline
------------------------


bar
========================
STDERR: (stream is empty)
------------------------
========================
Folder hierarchy:
./
|-- FOO-0
- generated xml file: /tmp/rebench-grade-64f47975ab584a8582ebac8b12d7594d.xml --
=========================== short test summary info ============================
PASSED tests/cli/test_faulty_invocations.py::test_key_does_not_exist
PASSED tests/cli/test_faulty_invocations.py::test_corrupt_yaml
PASSED tests/cli/test_faulty_invocations.py::test_corrupt_json
PASSED tests/cli/test_help_and_usage.py::test_usage_and_error_without_arguments
PASSED tests/cli/test_help_and_usage.py::test_help_on_h
PASSED tests/cli/test_help_and_usage.py::test_help_on_help
PASSED tests/cli/test_help_and_usage.py::test_version_on_v
PASSED tests/cli/test_help_and_usage.py::test_version_on_version
PASSED tests/cli/test_standard_usecases.py::test_source_environment
PASSED tests/cli/test_standard_usecases.py::test_unicode_var
PASSED tests/cli/test_standard_usecases.py::test_shadowing_json_env
PASSED tests/cli/test_standard_usecases.py::test_shadowing_yaml_env
PASSED tests/cli/test_standard_usecases.py::test_yaml_flow_style
PASSED tests/cli/test_standard_usecases.py::test_environment_by_default
PASSED tests/cli/test_standard_usecases.py::test_sub_dict_shadowing
PASSED tests/cli/test_standard_usecases.py::test_sub_dict_merging
PASSED tests/cli/test_standard_usecases.py::test_second_sub_dict_shadowing
PASSED tests/cli/test_standard_usecases.py::test_second_sub_dict_merging
PASSED tests/cli/test_standard_usecases.py::test_shadowing_of_dict
PASSED tests/cli/test_standard_usecases.py::test_keep_no_newline_at_end
PASSED tests/cli/test_standard_usecases.py::test_keep_one_newline_at_end
PASSED tests/cli/test_standard_usecases.py::test_keep_two_newlines_at_end
PASSED tests/cli/test_standard_usecases.py::test_keep_one_newline_at_beginning
PASSED tests/cli/test_standard_usecases.py::test_keep_two_newlines_at_beginning
PASSED tests/test_interface.py::test_current_help_in_readme
============================== 25 passed in 1.51s ==============================

<?xml version="1.0" encoding="utf-8"?><testsuites><testsuite name="pytest" errors="0" failures="0" skipped="0" tests="25" time="1.516" timestamp="2026-11-14T04:18:27.107831+00:00" hostname="e3187081d869"><testcase classname="tests.cli.test_faulty_invocations" name="test_key_does_not_exist" time="0.215" /><testcase classname="tests.cli.test_faulty_invocations" name="test_corrupt_yaml" time="0.049" /><testcase classname="tests.cli.test_faulty_invocations" name="test_corrupt_json" time="0.048" /><testcase classname="tests.cli.test_help_and_usage" name="test_usage_and_error_without_arguments" time="0.049" /><testcase classname="tests.cli.test_help_and_usage" name="test_help_on_h" time="0.048" /><testcase classname="tests.cli.test_help_and_usage" name="test_help_on_help" time="0.049" /><testcase classname="tests.cli.test_help_and_usage" name="test_version_on_v" time="0.050" /><testcase classname="tests.cli.test_help_and_usage" name="test_version_on_version" time="0.049" /><testcase classname="tests.cli.test_standard_usecases" name="test_source_environment" time="0.050" /><testcase classname="tests.cli.test_standard_usecases" name="test_unicode_var" time="0.050" /><testcase classname="tests.cli.test_standard_usecases" name="test_shadowing_json_env" time="0.050" /><testcase classname="tests.cli.test_standard_usecases" name="test_shadowing_yaml_env" time="0.050" /><testcase classname="tests.cli.test_standard_usecases" name="test_yaml_flow_style" time="0.050" /><testcase classname="tests.cli.test_standard_usecases" name="test_environment_by_default" time="0.050" /><testcase classname="tests.cli.test_standard_usecases" name="test_sub_dict_shadowing" time="0.051" /><testcase classname="tests.cli.test_standard_usecases" name="test_sub_dict_merging" time="0.050" /><testcase classname="tests.cli.test_standard_usecases" name="test_second_sub_dict_shadowing" time="0.050" /><testcase classname="tests.cli.test_standard_usecases" name="test_second_sub_dict_merging" time="0.050" /><testcase classname="tests.cli.test_standard_usecases" name="test_shadowing_of_dict" time="0.049" /><testcase classname="tests.cli.test_standard_usecases" name="test_keep_no_newline_at_end" time="0.050" /><testcase classname="tests.cli.test_standard_usecases" name="test_keep_one_newline_at_end" time="0.051" /><testcase classname="tests.cli.test_standard_usecases" name="test_keep_two_newlines_at_end" time="0.050" /><testcase classname="tests.cli.test_standard_usecases" name="test_keep_one_newline_at_beginning" time="0.049" /><testcase classname="tests.cli.test_standard_usecases" name="test_keep_two_newlines_at_beginning" time="0.049" /><testcase classname="tests.test_interface" name="test_current_help_in_readme" time="0.000" /></testsuite></testsuites>

  [   0.0s] 📋 System Prompt: You are a principal Python software engineer resolving a repository issue in `/workspace`.
  [   0.0s] 🎯 Task Prompt: You are evaluating a software engineering task for repository M3t0r/tpl.
  [  18.9s] 💭 (661 chars) "The user wants to fix a trailing newline issue in the `tpl` package.
The problem statement identifies that `tpl` always ..."
  [  18.9s] 🔧 run_command grep -rn --include="*.py" "jinja2" .
  [  19.0s]   → ./setup.py:36:    install_requires=["pyyaml>=3.13", "jinja2>=2.10"],
  [  23.0s] 💭 (89 chars) "The problem statement pointed to `tpl/__init__.py` line 72.
Let's read `tpl/__init__.py`."
  [  23.0s] 📖 read_file (tpl/__init__.py)
  [  23.1s]   ✓ {'status': 'ok', 'filepath': 'tpl/__init__.py', 'content': 'import sys\nimport os\nfrom getopt import 
getopt\nimport jso…
  [  77.2s] 💭 (2230 chars) "The issue is here:
```python
    # and render to output
    with open_file(arguments[1], "w") as output:
        templat..."
  [  77.2s] 🔧 run_command (34 lines) python3 - <<'PY'
  [  77.4s]   → error (exit 0): 
  [ 122.3s] 💭 (848 chars) "Ah, `main` takes `*args` and doesn't take a data dictionary as a separate argument. It 
parses data from options like `--..."
  [ 122.3s] 🔧 run_command (30 lines) python3 - <<'PY'
  [ 122.4s]   → Template without newline -> Result: 'Hello World\n'
  [ 152.2s] 💭 (1401 chars) "Confirmed. Both templates result in a trailing newline.
`Template without newline -> Result: 'Hello World\n'`
`Template ..."
  [ 152.2s] 🔧 run_command (5 lines) python3 - <<'PY'
  [ 152.2s]   → error (exit 0): 
  [ 158.8s] 💭 (78 chars) "My bad, f-string syntax error in python < 3.12 for backslashes in expressions."
  [ 158.8s] 🔧 run_command (7 lines) python3 - <<'PY'
  [ 158.9s]   → No newline: 'Hello'
  [ 169.0s] 💭 (257 chars) "Wait! `With newline: 'Hello'`!
It seems `jinja2.Template` (and thus the default environment) strips the trailing newline..."
  [ 169.0s] 🔧 run_command python3 -c "import jinja2; print(jinja2.__version__)"
  [ 169.1s]   → 3.1.6
  [ 181.2s] 💭 (137 chars) "In Jinja2 3.1.6, `keep_trailing_newline` might have a different default or behave 
differently.
Actually, let's try setti..."
  [ 181.2s] 🔧 run_command (14 lines) python3 - <<'PY'
  [ 181.2s]   → No newline: 'Hello'
  [ 231.6s] 💭 (2219 chars) "Okay, so:
- `keep_trailing_newline=True`: `Hello` -> `Hello`, `Hello\n` -> `Hello\n`
- `keep_trailing_newline=False`: `H..."
  [ 231.6s] 🔧 run_command python3 -c "import jinja2; t = jinja2.Template('test'); print(hasattr(t, 'stream
  [ 231.7s]   → True
  [ 256.6s] 💭 (557 chars) "Ah, it does have a `stream` method. My mistake.

So the plan is:
1. Replace `jinja2.Template(template_stream.read())` wi..."
  [ 256.6s] 🔧 run_command (17 lines) python3 - <<'PY'
  [ 256.6s]   → error (exit 0): 
  [ 267.1s] 💭 (40 chars) "F-string backslash again. I'll avoid it."
  [ 267.1s] 🔧 run_command (20 lines) python3 - <<'PY'
  [ 267.2s]   → No NL, keep=True: 'Hello'
  [ 324.0s] 💭 (2470 chars) "Perfect. The behavior is exactly as expected.

Now I just need to apply this to `tpl/__init__.py`.

Wait, I should check..."
  [ 324.0s] ✏️ edit_file (tpl/__init__.py)
  [ 324.1s]   ✓ {'status': 'ok', 'filepath': 'tpl/__init__.py', 'occurrences': 1, 'strategy': 'exact', 'diff': '--- 
a/tpl/__init__.py\n+…
  [ 336.7s] 💭 (57 chars) "Now I should verify the fix with the reproduction script."
  [ 336.7s] 🔧 run_command (25 lines) python3 - <<'PY'
  [ 336.8s]   → Template without newline -> Result: 'Hello World'
  [ 346.5s] 💭 (285 chars) "The reproduction script now shows:
`Template without newline -> Result: 'Hello World'`
`Template with newline -> Result:..."
  [ 346.5s] 🔧 run_command pytest tests/ -q --tb=short --no-header
  [ 348.0s]   → error (exit 0):