OMP sessions missing from Magic Context Dashboard

[pejc]

Short description

The Magic Context Dashboard lists OpenCode sessions but no OMP sessions, even with the harness filter set to All or Pi.

What happened?

Expected: OMP sessions should appear in the project session list and be readable like other Pi-compatible sessions.

Observed:

1. Start an OMP session with Magic Context enabled.
2. Open Magic Context Dashboard 0.13.0.
3. Open the affected project and view Sessions.
4. Select Harness: Pi or Harness: All.
5. No OMP sessions appear.

The shared Magic Context database contains Pi/OMP session metadata, but the dashboard's list_sessions_paged query with harness: "pi" returns zero rows.

Diagnostics

## OMP diagnostics
- Magic Context CLI: 0.38.0
- PASS: OMP 17.3.8 detected at ~/.bun/bin/omp
- PASS: @cortexkit/pi-magic-context 0.38.0 is enabled
- PASS: Plugin exposes an OMP/Pi extension manifest
- PASS: OMP native compaction is disabled
- PASS: OMP automatic memory backend is disabled
- PASS: OMP agent directory resolved to ~/.omp/agent
- PASS: Magic Context config parses: ~/.config/cortexkit/magic-context.jsonc
- PASS: Magic Context runtime config loads successfully
- PASS: SQLite integrity_check: ok
- INFO: OMP config: ~/.omp/agent/config.yml
- INFO: OMP plugin lock: ~/.omp/plugins/omp-plugins.lock.json
- INFO: OMP sessions: ~/.omp/agent/sessions
- INFO: Pi-compatible runtime log: /tmp/pi/magic-context/magic-context.log

## Additional info
Database evidence:
- Shared database contains primary sessions for both `opencode` and `pi` harnesses.
- Dashboard API: `list_sessions_paged({ harness: "pi", is_subagent: false })` -> `total: 0`.

Sanitized OMP JSONL prefix:
{"type":"title", ...}
{"type":"session", ...}

### Suspected cause

The dashboard's Pi/OMP session parser treats the first JSONL record as the session header and rejects the file unless that record has `type: "session"`. OMP writes a `type: "title"` record before the `type: "session"` record, so its files are silently skipped.

### Suggested fix

Update the Pi-compatible session parser to scan the initial JSONL records until it finds the `type: "session"` record, while retaining any preceding title metadata. Add a regression fixture whose first record is `type: "title"` and assert that it is returned by the OMP/Pi session scanner.

Plugin version

0.38.0

OpenCode version

OMP version: 17.3.8

Platform

Linux x64

Client

Pi

Log output (optional)