feat: Wire source_issue param through create/update/batch surfaces

[mabry1985]

Summary

Wire source_issue param through create/update/batch surfaces (bd-87i)

See the diff for details.

Fixes #97

[protoreview]

QA panel review — PASS

code-review-structural · head b0d125f783a7 · formal

[review-synthesizer completed: workflow code-review-structural:report]

Prose Brief

Overall risk: Low. A ~700-line purely additive change introducing new functionality with safe defaults and strict normalization gated before any mutation. All four LLM finders returned empty arrays, and the structural verifier spot-checked loop.py for the _source_issue import dependency and traced every code path — confirming zero defects.

Fix-first item: None. No findings survive verification; nothing needs fixing.

Panel disagreement: None. Unanimous empty-array verdicts across all finders and the structural pass.

What verification changed: Nothing. The verifier confirmed the clean slate — no findings were refuted, marked uncertain, or re-graded.

Gaps / Coverage note: No finder reported Gap: lines. The structural pass (code-review-structural:verify) completed successfully. With ~21 tests covering happy paths, rejection cases, batch isolation, and round-trip compatibility, coverage is thorough for an additive change of this kind.

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[protoreview]

Promoting the PASS verdict for head b0d125f783a7: all checks terminal-green, zero unresolved review threads. (approve-on-green)