- Add S9 to §6 Safety Invariants: zero close-PR API calls in dispatch
- Document worker ABSOLUTE CONSTRAINTS in §8 Worker Templates
- Add §9 entry for Issue #157 explaining the fix
All worker templates already contain the NEVER-close constraint from
a prior session. This commit makes the spec authoritative.
Companion changes in rodin/workspace:
- check-invariants.sh: add S9 static check
- dispatch.bats: add Bug-157-regression test