docs(agents): promote v1.0.8 release learnings

Record three confirmed v1.0.8 failure modes (expo prebuild native
regressions, npm 10/11 lockfile divergence, local EAS build
preconditions) and promote each into docs/releasing.md, a new
docs/development/dependencies.md, and the release-preflight script.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs/index.md

@@ -8,6 +8,7 @@ historical notes. Agents should load only the section relevant to their task.
 - [System architecture](architecture/system.md)
 - [Client data freshness](architecture/client-data-freshness.md)
 - [Local full-stack development](development/local-stack.md)
+- [Dependency and lockfile discipline](development/dependencies.md)
 - [Testing strategy](testing/strategy.md)
 - [Database migration safety](operations/database-migrations.md)
 - [Backend deployment and branching](operations/backend-deployments.md)