* feat(#1682): OpenCode session.idle + opencode-subset dialect + Claude parity — Slice 1b/c
- Plugin (.opencode/plugins/gsd-core.js): handle session.idle (↔ Claude Stop
lifecycle point; no-op sentinel — state already persisted to .planning/).
Completes the compaction/idle pair (#1914 shipped compaction).
- Declare hookEvents: 'opencode-subset' in the OpenCode descriptor — the
reserved dialect now has a real consumer (no longer zero-consumer).
- host-integration.cts: add HOOK_EVENT_SURFACES + hookEventSurfaceFor() — the
pure consumer that resolves a dialect to its host-fireable event surface.
opencode-subset = session/tool/file subset with NO workflow-phase events
(engine owns phase sequencing; ADR-1239 §OpenCode binding).
- Tests: hookEventSurfaceFor unit tests (claude/gemini/opencode-subset/null);
plugin session.idle no-throw; compaction breadcrumb; opencode-subset surface
parity vs the plugin's handlers (Claude parity).
* fix(#1682): don't declare hookEvents on opencode (hooksSurface:none invariant)
The repo invariant couples runtime.hookEvents to the managed settings.json hook
surface: hooksSurface:'none' runtimes (opencode — plugin owns hooks) must NOT
declare hookEvents. Declaring 'opencode-subset' there violated 3 capability-
registry invariants + 2 install-plan golden masters + opencode golden parity.
The opencode-subset dialect is still IMPLEMENTED — just not via the legacy
descriptor field: hookEventSurfaceFor() (host-integration.cts) is its consumer,
and the OpenCode plugin consumes the subset events at runtime (session.idle
added here; compaction shipped in #1914). Declaring it on the descriptor would
require weakening the hooksSurface:none ⇔ no-hookEvents invariant (flagged for
decision).
* fix(#1682): refresh opencode golden parity for plugins/gsd-core.js (session.idle)
* docs(changeset): OpenCode session.idle + opencode-subset dialect (#1682)
* docs(changeset): backfill PR #1930
325e9fad4b