docs(opencode): add branch status summary

Author: Danigm-dev

PR-3761-BRANCH-STATUS.md

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+# PR 3761 Branch Status
+
+## Scope
+
+This note summarizes the branches involved in PR `#3761` and the final state of each one from this worktree.
+
+PR: `https://github.com/simstudioai/sim/pull/3761`
+
+## Branches
+
+### `staging`
+
+- Role: base branch of PR `#3761`
+- Expected state: unchanged by this worktree
+- Relationship to this work: `feat/opencode-optional-runtime` is intended to merge into `staging`
+
+### `feat/opencode-optional-runtime`
+
+- Role: feature branch for the OpenCode integration and optional runtime overlay
+- Local state: in sync with `origin/feat/opencode-optional-runtime`
+- Worktree state at the end of this session: clean
+- Latest commit at the end of this session: `5ab2b5f4c`
+
+### `origin/feat/opencode-optional-runtime`
+
+- Role: remote branch backing PR `#3761`
+- Remote state at the end of this session: matches local `feat/opencode-optional-runtime`
+- Latest pushed commit at the end of this session: `5ab2b5f4c`
+
+## Final State Of `feat/opencode-optional-runtime`
+
+At the end of this session, the branch contains:
+
+- OpenCode block integration in Sim
+- OpenCode tools, API routes, and `apps/sim/lib/opencode`
+- optional OpenCode runtime overlay under `docker/` and dedicated compose files
+- OpenCode hidden by default behind `NEXT_PUBLIC_OPENCODE_ENABLED`
+- `docker-compose.local.yml` and `docker-compose.prod.yml` preserved as defaults
+- external runtime hardening, including configurable `OPENCODE_REPOSITORY_ROOT`
+- fail-fast production overlay behavior when `OPENCODE_SERVER_PASSWORD` is missing
+- focused fixes for review feedback around:
+  - stale session retry handling
+  - repository resolution reuse
+  - internal URL leakage in route errors
+  - Docker runtime detection caching
+  - async selector refetch behavior in dropdown/combobox
+  - OpenCode retry session persistence
+  - root-path and retry-error hardening
+  - entrypoint port validation
+
+## Final Commit Sequence Applied In This Session
+
+- `1e174f75a` `fix(opencode): avoid redundant resolution and url leaks`
+- `35fac8dd3` `fix(opencode): clean up low severity review notes`
+- `35949bb16` `fix(opencode): harden root path and retry errors`
+- `3458868ba` `refactor(opencode): keep base url helper private`
+- `a27de0d7c` `fix(editor): avoid stale open-change fetch gating`
+- `a8fb07354` `fix(opencode): persist fresh retry sessions`
+- `2bb744a38` `fix(opencode): tighten retry and entrypoint guards`
+- `5ab2b5f4c` `fix(editor): stabilize async option refetching`
+
+## End-State Summary
+
+- Current branch: `feat/opencode-optional-runtime`
+- Base branch: `staging`
+- PR branch remote: `origin/feat/opencode-optional-runtime`
+- Local/remote divergence at the end of this session: none
+- Worktree cleanliness at the end of this session: clean