refactor(ticket-191): extract helpers from get_agent_availability (STARTER-609)

[tom-sapletta-com]

Reduce cyclomatic complexity of get_agent_availability from CC=15 (limit 15) by extracting behavior-preserving module-level helpers (_environment_override, _availability_from_registry_entry, _with_expired_block_reset).

• Pure refactor: env-override precedence, registry parsing, invalid-entry fallback and temporary-block expiry semantics are byte-for-byte equivalent.
• tests/test_agent_availability.py passes unmodified (7 passed).
• ruff check passes; project/governance-check.sh --base origin/main = GOV-PASS.
• Planfile source ticket: STARTER-609.

[ifuri-validator-agent]

Validator approval after policy checks for exact head bd69f69c67d0e5e866708901e3507277f033cf9d.

Ticket: ticket-191
Correlation ID: local-semcod-koru-pr-375-ticket-191
Model: zai/glm-5.3
Reviewed diff chunks: 1
Advisory LLM verdict: APPROVE
Advisory summary: Reviewed all 1 diff chunk(s). Pure behavior-preserving refactor of get_agent_availability (CC 15 → 5) into three focused module-level helpers. Env-override precedence, registry parsing, invalid-entry fallback, and expired-block semantics are preserved in the visible diff. Required checks (onedev/local-verify, standard packs/conformance) all pass; pending 'smoke' check is excluded and non-blocking. Ticket intent and README documentation are consistent with the change.
Advisory findings: none
The LLM output above is advisory and was not used as the approval trust root.
Semantic review prerequisite: not_required; policy 676cb4516bbfed2a000e40b9b1b6e4a430ecc761ec546aeb53d721a1905cfdd7.

Actual PR impact radar

Exact range: f171fe09a90cd59315de70a8b02b87db1158ff89...bd69f69c67d0e5e866708901e3507277f033cf9d
Change digest: 88908485d67b7f0c005edccf72b076d0db4fc16ab030b7f8f0d922d6bec79804
Score: 48/100 (M), estimated 56 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-191-9869
TICKET ticket-191
HEAD_SHA bd69f69c67d0e5e866708901e3507277f033cf9d
CORRELATION_ID local-semcod-koru-pr-375-ticket-191
ACTOR agent:ifuri-validator-agent[bot]
APPLIED_RULE P-CORE-015
INPUT author_login = "tom-sapletta-com"
INPUT observed_checks = ["governance / enforce=PASS","standard packs / conformance=PASS","governance / remote lifecycle=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 semantic_review_assessment = {"schema":"subactor.validator/semantic-review-assessment/v1","subject":{"repository":"semcod/koru","pull_request":375,"head_sha":"bd69f69c67d0e5e866708901e3507277f033cf9d","base_sha":"f171fe09a90cd59315de70a8b02b87db1158ff89","diff_sha256":"2705be6cfb21ce077e8d63811f397a88d680fdc82e377d9b497b1fe437076e64"},"policy":{"policy_schema":"subactor.validator/semantic-review-policy/v1","policy_version":1,"policy_sha256":"676cb4516bbfed2a000e40b9b1b6e4a430ecc761ec546aeb53d721a1905cfdd7","required":false,"critical_paths":[],"observed_paths":["project/ticket-191/README.md","project/ticket-191/intent.json","src/koru/agent_availability.py"]},"grounding":"full-diff-not-per-finding-proof","execution_authority":false,"status":"not_required","reason":null,"review_sha256":null,"unresolved":[]}
INPUT superseded_checks = ["smoke"]
INPUT ticket_radar_receipt = {"schema":"subactor.ticket-radar/v1","base_sha":"f171fe09a90cd59315de70a8b02b87db1158ff89","head_sha":"bd69f69c67d0e5e866708901e3507277f033cf9d","change_digest":"88908485d67b7f0c005edccf72b076d0db4fc16ab030b7f8f0d922d6bec79804","score":48,"complexity":"M","estimated_minutes":56,"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"