Release v1.9.3

[stef-k]

Summary

• release Wayfarer v1.9.3
• include the corrected guarded PostgreSQL clone-workflow fixture from Fix PostgreSQL clone fixture user ownership #497
• align runtime version documentation and version assertions

Validation

• release helper: passed for v1.9.3
• runtime CLI: Wayfarer 1.9.3
• versioning tests: 26 passed
• corrected guarded PostgreSQL clone workflow: 1 passed, 0 failed/skipped
• Release build: succeeded, 0 warnings/errors
• Vite production build: succeeded
• ordinary non-browser suite: 2,347 passed, 150 opt-in PostgreSQL skips, 0 failed
• LOC policy: passed; pre-existing warnings only
• git diff --check: passed

Database

No migration or production database behavior change.