feat(hooks): bridge SessionStart and SessionEnd Claude Code hook events

[jainnam-1993]

Summary

Completes the Claude Code hook compatibility layer from 5/7 to 7/7 hook events by adding SessionStart and SessionEnd bridging.

Problem

oh-my-opencode bridges 5 of 7 Claude Code hook events (PreToolUse, PostToolUse, UserPromptSubmit, Stop, PreCompact), but SessionStart and SessionEnd are missing. This breaks session context injection for users relying on Claude Code hooks — for example, ECC's session-start.js which injects previous session summaries, or custom session-context-loader.sh hooks.

Solution

Bridge the two missing events using the same patterns established by the existing hook bridge:

• session.created (OpenCode) → SessionStart (Claude Code) — hook stdout is collected and injected into the session context via ctx.client.session.prompt() + createInternalAgentTextPart()
• session.deleted (OpenCode) → SessionEnd (Claude Code) — fire-and-forget execution

Files Changed

File	Change
types.ts	Add SessionStart/SessionEnd to ClaudeHookEvent union, ClaudeHooksConfig, plus input interfaces
config.ts	Add both events to normalizer and merger eventTypes arrays
config-loader.ts	Add both events to mergeDisabledHooks()
session-start.ts (new)	executeSessionStartHooks (collects stdout) + executeSessionEndHooks (fire-and-forget)
session-event-handler.ts	Wire session.created → SessionStart and session.deleted → SessionEnd

Design Decisions

• No exit-code-2 blocking for SessionStart (matches Claude Code behavior)
• SessionEnd is fire-and-forget (no blocking, no injection)
• Subagent sessions skipped via parentSessionId check (matches Stop hook pattern)
• isHookDisabled() respected for both new events
• Zero impact on existing 5 hook event behaviors

Verification

• bun run typecheck — passes (zero errors)
• bun run build — succeeds

---

Summary by cubic

Bridges Claude Code SessionStart and SessionEnd hook events, completing the compatibility layer (5/7 → 7/7). On session create, hook stdout is injected into the session; on session delete, hooks run and per-session state is cleared.

• New Features
  • Map OpenCode session.created → SessionStart; inject stdout via ctx.client.session.prompt() with createInternalAgentTextPart().
  • Map session.deleted → SessionEnd; fire-and-forget execution and clear per-session hook state.
  • Add types/config support and executeSessionStartHooks/executeSessionEndHooks; skip subagent sessions; respect disabled hooks; no exit-code-2 blocking for SessionStart.

^{Written for commit f4139ce. Summary will update on new commits.}

[github-actions]

All contributors have signed the CLA. Thank you! ✅
_{Posted by the CLA Assistant Lite bot.}

[cubic-dev-ai]

No issues found across 5 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Auto-approved: Adds SessionStart/End hooks following established patterns; changes are additive and well-isolated from existing hook logic, ensuring no regressions.}

---

Since this is your first cubic review, here's how it works:

• cubic automatically reviews your code and comments on bugs and improvements
• Teach cubic by replying to its comments. cubic learns from your replies and gets better over time
• Add one-off context when rerunning by tagging @cubic-dev-ai with guidance or docs links (including llms.txt)
• Ask questions if you need clarification on any suggestion

[jainnam-1993]

I have read the CLA Document and I hereby sign the CLA

[acamq]

recheck

[acamq]

@jainnam-1993 It looks like the email of the commit and your github account do not match. Please re-author the commit with an email that is linked to your GitHub account (your no-reply github email works).

[jainnam-1993]

recheck