refactor(scan): separate todo2code suggestion mapping

[tom-sapletta-com]

Extracts conversion of one useful todo2code plan into a focused suggestion helper while preserving filtering, truncation, priority, labels and evidence.\n\nValidation: 15 focused tests, Koru-driven regressions, Ruff, governance, Docker Compose and compileall passed. Ticket: ticket-118.

[ifuri-validator-agent]

Deterministic Validator approval for exact head 908ce3f703f3f4034d88ccbecef9c1e6f05043a7.

Ticket: ticket-118
Correlation ID: local-semcod-koru-pr-154-ticket-118
Model: zai/glm-5.3
Reviewed diff chunks: 1
Advisory LLM verdict: APPROVE
Advisory summary: Reviewed all 1 diff chunk(s). Clean behavior-preserving extraction of per-plan todo2code suggestion construction into _todo2code_plan_suggestion. Dependencies passed as parameters match previous inline usage (_PRIORITY_MAP, _plan_dedupe_key, TODO2CODE_SOURCE), and filtering, truncation, priority normalization, labels, evidence and dedupe key logic are identical to the removed inline code. Intent metadata is consistent with allowed paths.
Advisory findings: none
The LLM output above is advisory and was not used as the approval trust root.

Actual PR impact radar

Exact range: 5aadcaaf87bd43c52ee33c414c7b9c10e6eeaa13...908ce3f703f3f4034d88ccbecef9c1e6f05043a7
Change digest: d66e9cf3865767f6d4a3d6692f2175939b02840fcb606174d3deb6712ec17ac3
Score: 32/100 (M), estimated 37 min, split recommended: true
Affected services/components: repository-wide/unclassified

Machine-readable radar JSONL and SVG

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Merge will be attempted after this approval when explicitly authorized. ## Decision record (recomputable)

DECISION D-118-6678
TICKET ticket-118
HEAD_SHA 908ce3f703f3f4034d88ccbecef9c1e6f05043a7
CORRELATION_ID local-semcod-koru-pr-154-ticket-118
ACTOR agent:ifuri-validator-agent[bot]
APPLIED_RULE P-CORE-015
INPUT author_login = "tom-sapletta-com"
INPUT observed_checks = ["standard packs / conformance=PASS","governance / remote lifecycle=PASS","governance / enforce=PASS","onedev/local-verify=PASS"]
INPUT required_checks = ["onedev/local-verify","standard packs / conformance"]
INPUT required_checks_source = "protected registry + GitHub applied rules (env/request)"
INPUT reviewer_login = "ifuri-validator-agent[bot]"
INPUT superseded_checks = ["smoke"]
INPUT ticket_radar_receipt = {"schema":"subactor.ticket-radar/v1","base_sha":"5aadcaaf87bd43c52ee33c414c7b9c10e6eeaa13","head_sha":"908ce3f703f3f4034d88ccbecef9c1e6f05043a7","change_digest":"d66e9cf3865767f6d4a3d6692f2175939b02840fcb606174d3deb6712ec17ac3","score":32,"complexity":"M","estimated_minutes":37,"split_recommended":true,"services":[],"authority":"ADVISORY","promotion":"FORBIDDEN"}
VERDICT APPROVE AUTHORITY DETERMINISTIC
REJECTED REQUEST_CHANGES BECAUSE NO_UNSAFE_CHANGE_REASON_FOUND
ADVISORY llm_verdict = "APPROVE" MODEL "zai/glm-5.3"
ASSERT VERDICT_AUTHORITY != "ADVISORY"