Enforce config example drift checks in CI and release

- add `verify:config-example` script with tests to fail on missing/stale generated config artifacts
- run the verification in CI and release workflows, and document it in release/docs guidance
- fix docs-site Cloudflare Pages watch path to `docs-site/*` with regression coverage

Makefile

@@ -165,7 +165,6 @@ generate-config: ensure-bun
 	@bun run electron . --generate-config
 
 generate-example-config: ensure-bun
-	@bun run build
 	@bun run generate:config-example
 
 dev-start: ensure-bun