fix(automation): stop evidence-only PR accumulation

[vntrevx]

Root cause

The 4-hour compatibility watcher opened one Spot and one Futures evidence-only Draft PR for each new upstream SHA. Deduplication included the upstream commit, so an unchanged generic_lowering blocker produced 26 open Draft PRs.

Fix

• route blocked generic semantics to the existing deduplicated nfi-compatibility issue
• retain every decision in the append-only compatibility ledger
• remove the semantic-review PR writer, write permission, and CI bypass
• reserve Draft PRs for independently exact compact fixture candidates that contain a real repository change
• keep official-only fallback and prohibit automatic semantic merge

Validation

• dependency-free CI contract: 8 passed
• Future-NFI automation acceptance: 138 passed
• focused automation tests: 47 passed
• Ruff and BasedPyright passed
• no runtime, fixture, certificate, or release asset changed

After merge, the 26 stale GitHub Actions semantic-review Draft PRs will be closed with a superseded explanation and their automation branches deleted.

[chatgpt-codex-connector]

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