fix: reject invalid strategy input before validation and TODO writes

[tom-sapletta-com]

Invalid strategy input used to become an empty mapping in ticket validation and TODO synchronization. This could report zero tickets or process result markers despite a failed configuration read.

Both APIs now share a loader that requires a readable UTF-8 YAML mapping. Missing/unreadable files, invalid encoding, malformed YAML and non-mapping documents raise stable ValueError messages without including YAML contents. An explicit empty mapping remains valid. TODO loading completes before any checkbox writes.

Validation: reproduced 10 failing cases before the fix; all 486 project tests passed after it (6 skipped). The pinned documentation checker passed with no findings or warnings. Python API documentation is updated to version 2 and binds the implementation revision.

Closes #65. Qualifies and repairs Doctor diagnoses subactor/doctor-agent#381 / PLF-13741 and #382 / PLF-13742. Source merge alone does not assert deployment or close those diagnostic records.

[ifuri-validator-agent]

Deterministic Validator approval for exact head 0eb496d779a461430d6a24cd18ef381db4754eb7.

Ticket: ticket-065
Correlation ID: local-semcod-planfile-pr-66-ticket-065
Model: zai/glm-5.3
Advisory LLM review: LLM_UNAVAILABLE
Reason: litellm.RateLimitError: RateLimitError: ZaiException - Weekly/Monthly Limit Exhausted. Your limit will reset at 2026-09-11 15:27:59
This approval rests on the deterministic checks alone; no advisory opinion was recorded for this head.

Actual PR impact radar

Exact range: bfc2db12d4e7bf30fe1402dfbf81c1b638576bd5...0eb496d779a461430d6a24cd18ef381db4754eb7
Change digest: 4c4cabcaba62688738bc9498a71229e6ce52becf0b1a268a23e8bcf9cd7cffd6
Score: 72/100 (L), estimated 80 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-065-9567
TICKET ticket-065
HEAD_SHA 0eb496d779a461430d6a24cd18ef381db4754eb7
CORRELATION_ID local-semcod-planfile-pr-66-ticket-065
ACTOR agent:ifuri-validator-agent[bot]
APPLIED_RULE P-CORE-015
INPUT author_login = "tom-sapletta-com"
INPUT observed_checks = ["notify=PASS","ci-loop=PASS","test (3.10)=PASS","test (3.13)=PASS"]
INPUT required_checks = ["ci-loop","notify"]
INPUT required_checks_source = "protected registry (env/request)"
INPUT reviewer_login = "ifuri-validator-agent[bot]"
INPUT superseded_checks = []
INPUT ticket_radar_receipt = {"schema":"subactor.ticket-radar/v1","base_sha":"bfc2db12d4e7bf30fe1402dfbf81c1b638576bd5","head_sha":"0eb496d779a461430d6a24cd18ef381db4754eb7","change_digest":"4c4cabcaba62688738bc9498a71229e6ce52becf0b1a268a23e8bcf9cd7cffd6","score":72,"complexity":"L","estimated_minutes":80,"split_recommended":true,"services":[],"authority":"ADVISORY","promotion":"FORBIDDEN"}
VERDICT APPROVE AUTHORITY DETERMINISTIC
REJECTED REQUEST_CHANGES BECAUSE NO_UNSAFE_CHANGE_REASON_FOUND
ADVISORY llm_verdict = "" MODEL "zai/glm-5.3"
ASSERT VERDICT_AUTHORITY != "ADVISORY"