[Desktop] Validate Codex Desktop hook coverage

[teseo]

Kind

scout

Goal

Produce evidence for whether Codex Desktop delivers the same hooks and state boundaries as Codex CLI.

Non-goals

• Claiming support based only on CLI documentation.
• Implementing undocumented desktop workarounds.
• Blocking the CLI adapter on unverified desktop behavior.

Invariants

• Each tested event has a reproducible observation.
• Desktop findings are recorded separately from CLI findings.
• A failed probe results in conditional or advisory support, not silent promotion.

Behavioral contract / States

Run a desktop smoke matrix for session start, prompt submit, pre-tool, post-tool, compaction, stop, session end, multiple worktrees, and trust/config loading. Record observed input/output and enforcement result.

Scope surface

Desktop smoke fixtures, probe scripts, evidence notes, and compatibility decision.

Acceptance

• Execute the complete matrix against the installed Codex Desktop version.
• Record pass/fail/unknown for every event and the exact version tested.
• Add or update a test that fails if a claimed full-support event is not observed.
• The issue ends with one of: full adapter support, conditional support with documented limits, or advisory-only support.

Split triggers

• Desktop and CLI need separate adapters.
• Desktop has no deterministic pre-tool enforcement.

Dependencies / Parent

Blocked by: #7
Parent Epic: #15