Replace manual in-process _SESSION_LEASE seeding with an auditable
gitea_adopt_merger_pr_lease tool that posts durable adoption proof and
records sanctioned session provenance. Mutation gates now reject bare
record_session_lease calls without provenance from acquire/adopt/heartbeat.
Closes#536
Bootstrap repo-tracked wiki pages (10 required pages), the operator-
confirmed sync script, PR template publication gate, and safety tests so
Gitea-Tools can publish to the live Gitea Wiki per issue #224.
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>