Fix nested batch replacement review lookup

[Ahmed-Hindy]

Summary

• align batch-replace MP4 lookup with batch-convert nested review naming
• share batch output deduplication so replacement lookup mirrors collision suffixes
• add nested and colliding-name regressions, and update cleanup docs

Root cause

batch-convert writes review MP4 names with relative folder context, such as _review_mp4s/shot_a_render.mp4, but batch-replace looked up only the sequence prefix, such as _review_mp4s/render.mp4.

Validation

• uv --native-tls run --extra dev pytest tests/test_sequence_replacement.py tests/test_batch.py
• uv --native-tls run --extra dev ruff check src\renderkit\core\batch.py src\renderkit\core\sequence_replacement.py src\renderkit\cli\batch.py src\renderkit\cli\main.py tests\test_sequence_replacement.py tests\test_batch.py
• uv --native-tls run pre-commit run --files docs/usage.md src/renderkit/cli/batch.py src/renderkit/cli/main.py src/renderkit/core/batch.py src/renderkit/core/sequence_replacement.py tests/test_batch.py tests/test_sequence_replacement.py
• issue repro now reports match: True

Notes

A full local uv --native-tls run --extra dev pytest run hit an order-dependent logging/capture failure in tests/test_converter.py::TestSequenceConverterProgress::test_non_interactive_stderr_disables_tqdm_by_default; that same test passes when run in isolation.

Closes #85

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 93.75000% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/renderkit/core/batch.py	88.88%	1 Missing ⚠️
src/renderkit/core/sequence_replacement.py	94.11%	1 Missing ⚠️

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