release: prepare v0.1.35

[Obed0101]

Summary

• harden Loop scheduling, worktree discovery, interruption, and fail-closed recovery
• keep large session transcripts and Usage Insights responsive
• add customizable stats widgets, Codex subscription usage, and bounded same-project peer messaging
• prepare MendCode v0.1.35 metadata and release notes

Validation

• bun test release-focused suite: 573 pass, 1 manual skip, 0 fail
• SDK TypeScript check: pass
• dev-rearm smoke: pass
• git diff --check: pass
• opencode TypeScript check: blocked by existing httpapi-sdk.test.ts optional-response contract errors