fix(sources): classify sidecars before live session admission

[Sinity]

Summary

Keep declared metadata and workflow sidecars as durable raw evidence instead of materializing them as sessions.

Problem

The validation-off worker shortcut and full/append live ingestion could override path-declared artifact classification, allowing session-shaped workflow records to become conversations.

Solution

Honor path classification before the fast stream shortcut and route declared non-session payloads through typed raw-artifact admission in full and append live paths.

Verification

• Focused real-route suite: 101 passed
• Adjacent taxonomy suite: 76 passed
• devtools verify --quick: passed
• git diff --check: passed

Ref polylogue-b508 and polylogue-ioz7

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📥 Commits

Reviewing files that changed from the base of the PR and between 5f34505 and b81d36b.

📒 Files selected for processing (5)

• polylogue/pipeline/services/ingest_worker.py
• polylogue/sources/live/append_ingest.py
• polylogue/sources/live/batch.py
• tests/unit/pipeline/test_quarantine_fixtures.py
• tests/unit/sources/test_live_batch_support.py

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[Sinity]

Scope disposition: this PR is superseded by the merged sidecar admission work in Ref #3794 and the raw-admission routing in Ref #3772. The newer implementation covers the same full, append, and artifact paths with the shared ZIP admission contract. No additional code from this branch is required.

[Sinity]

Closed as superseded by the merged sidecar and raw-admission implementations documented above.