test(engines): parametrize wire-protocol tests across all sidecar engines

[paoloantinori]

Every sidecar (9 modules) carries its own copy of the length-prefixed JSON wire protocol. This parametrizes the 4 protocol invariants across all of them so a bug in any copy is caught.

Inspired by @debpalash's test_pockettts_sidecar.py (PR paoloantinori#1), which established the pattern for a single sidecar. This lifts the generic protocol tests (send/recv roundtrip, EOF, oversized-frame cap, truncated-body) so every sidecar inherits the same coverage. Engine-specific tests (language, PCM, voice cache) stay in each engine's own file.

36 test cases, 0.6s, no deps (all sidecar modules are stdlib-only at import time).

Adds 36 parametrized wire-protocol tests for all nine sidecar engines. The tests verify round trips, EOF handling, oversized-frame rejection, and truncated-body errors. The change is test-only and adds no dependencies or production behavior.

[coderabbitai]

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• tests/test_subprocess_sidecar_wire.py

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📝 Walkthrough

Walkthrough

The pull request adds shared parametrized tests for subprocess sidecar wire protocols. The tests cover round trips, clean EOF, oversized frames, and truncated bodies across sidecar modules.

Changes

Subprocess sidecar wire protocol

Layer / File(s)	Summary
Wire-protocol validation tests/test_subprocess_sidecar_wire.py	Parametrized tests validate length-prefixed JSON-over-stdio round trips, clean EOF handling, maximum-frame rejection, and truncated-body errors across subprocess sidecar modules.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 8 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description explains the change and test scope but omits the required Summary, Changes, Type, Testing, Checklist, and Release cadence sections.	Rewrite the description using the repository template and include the test method, applicable type, checklist status, and release cadence information.

✅ Passed checks (8 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title uses Conventional Commit syntax with a scope and accurately describes the parametrized wire-protocol tests.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Cross-Platform Default Parity	✅ Passed	The commit adds only tests/test_subprocess_sidecar_wire.py; it changes no default runtime behavior or platform-specific code, so parity is not applicable.
I18n Completeness (21 Locales)	✅ Passed	The commit changes only tests/test_subprocess_sidecar_wire.py; it adds no frontend code, t('...') keys, or hardcoded frontend user-facing strings.
Local-First Guarantee	✅ Passed	The PR adds only stdlib/pytest wire tests; it makes no network, credential, account, telemetry, or reporting calls, and sidecar model downloads remain lazy and opt-in.
Backward Compatibility	✅ Passed	HEAD changes only add tests/test_subprocess_sidecar_wire.py; no production, database schema, migration, installation, or model-download changes can affect existing data or weights.

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