make the clide command surface self-describing

Parity guarantees a verb exists for every UI action, but a verb is
unreachable if nothing advertises it. Add `clide capabilities` — it
reflects the live dispatcher registry to JSON (subsystem, verb, arg
schema) so the surface is discoverable and can't drift from what
dispatches. A thin /clide skill points Claude at it rather than
hard-coding a verb list, so new panels become reachable the moment
they register.

Co-Authored-By: Claude <noreply@anthropic.com>

.pql/changelog/ticket_history/2026-06.sql

@@ -361,3 +361,4 @@ INSERT INTO ticket_history (ticket_id, field, old_value, new_value, changed_by,
 DONE (2026-06-06). Keybinding + nav were already wired (T-117 binds ctrl/meta+shift+p -> PaletteOpenIntent; _RootShell handles it -> palette.open(); T-100 added arrow/Enter/Esc nav + selected-index). Remaining acceptance implemented now: (1) FUZZY match — PaletteController.filtered() uses a shared subsequence matcher (lib/kernel/src/fuzzy.dart, extracted from quick_open so both share one source of truth), ranked best-score-first; (2) RECENCY — invoked commands float to the top on empty filter and break fuzzy-score ties (in-session MRU). DEFERRED: ''pinned'' commands + cross-session recency persistence need a pin affordance + settings storage — filed as a follow-up. Tests: test/kernel/src/commands/palette_test.dart + test/kernel/src/fuzzy_test.dart.', NULL, '2026-06-06 07:40:43', '2026-06-06 07:40:43', '2026-06-06 07:40:43', NULL, '725ba044d75722c460c7869a2249c386', 1) ON CONFLICT(hash) DO NOTHING;
 INSERT INTO ticket_history (ticket_id, field, old_value, new_value, changed_by, changed_at, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('T-23', 'status', 'ready', 'done', NULL, '2026-06-06 07:40:43', '2026-06-06 07:40:43', '2026-06-06 07:40:43', NULL, '121337ddae4598659f07bbe16c1ddcc3', 1) ON CONFLICT(hash) DO NOTHING;
 INSERT INTO ticket_history (ticket_id, field, old_value, new_value, changed_by, changed_at, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('T-250', 'status', 'ready', 'done', NULL, '2026-06-06 07:49:08', '2026-06-06 07:49:08', '2026-06-06 07:49:08', NULL, '0765a2ccbb37deedb402d06709511928', 1) ON CONFLICT(hash) DO NOTHING;
+INSERT INTO ticket_history (ticket_id, field, old_value, new_value, changed_by, changed_at, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('T-248', 'status', 'ready', 'done', NULL, '2026-06-06 07:57:16', '2026-06-06 07:57:16', '2026-06-06 07:57:16', NULL, 'b36bb78451373dae70a8b5f1f0e16ace', 1) ON CONFLICT(hash) DO NOTHING;

.pql/changelog/tickets/2026-06.sql

@@ -804,3 +804,14 @@ Acceptance:
 - Regression test at the session level: setPermissionMode emits an updated SessionStatus on statusStream.
 
 Refs: T-226 (interactive mode badge + Ctrl/Cmd+M), T-181 (bypassPermissions behind confirmed path — keep excluded from the safe cycle), D-78 (interaction-zone / display-only conventions).', 'done', 'high', NULL, NULL, NULL, '2026-06-06 07:26:50', '2026-06-06 07:49:08', NULL, 'e381f4325ef95d18da12a82646d24d9a', 1) ON CONFLICT(id) DO UPDATE SET type=excluded.type, parent_id=excluded.parent_id, title=excluded.title, description=excluded.description, status=excluded.status, priority=excluded.priority, assigned_to=excluded.assigned_to, team=excluded.team, decision_ref=excluded.decision_ref, updated_at=excluded.updated_at, deleted_at=excluded.deleted_at, hash=excluded.hash, canonical_version=excluded.canonical_version WHERE excluded.updated_at > tickets.updated_at OR (excluded.updated_at = tickets.updated_at AND excluded.hash > tickets.hash);
+INSERT INTO tickets (id, type, parent_id, title, description, status, priority, assigned_to, team, decision_ref, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('T-248', 'story', NULL, '/clide skill — advertise the clide tool surface to Claude', 'Create a `/clide` skill (none exists today — only legacy templates under legacy/clide/templates/skills/) that advertises the clide CLI surface to Claude so new affordances become discoverable.
+
+Problem: my knowledge of the clide surface comes from a hand-curated session blurb. There is no runtime discovery — `clide help` is a stub, `clide <subsystem>` with no verb just prints `usage:`, and the dispatcher''s registered command table (e.g. pane_commands.dart) is never exposed. D-6 guarantees a verb EXISTS for every UI action, but parity != discoverability: a correctly-registered verb is still unreachable if nothing tells me it''s there.
+
+Scope:
+- Self-description first (prereq for a non-rotting skill): add a discovery verb that reflects the live dispatcher registry — e.g. `clide capabilities` (machine-readable JSON: subsystems -> verbs -> arg schema) and/or flesh out `clide help` to enumerate subsystems/verbs. Sourced from the registry so it never drifts.
+- `/clide` SKILL.md: trigger description always visible to Claude; body points at the discovery verb rather than hard-coding a verb list, plus conventions (slots: sidebar/workspace/context, pane kinds, focus/spawn/close/write/resize). Thin and always-correct.
+
+This is what makes T-249 (image viewer) and future panels reachable by Claude the moment they register — no skill edit per panel.
+
+Refs: D-6 (CLI/event-surface parity). Related: T-249.', 'done', 'medium', NULL, NULL, 'D-6', '2026-06-06 07:21:17', '2026-06-06 07:57:16', NULL, 'f6a976eef4c722612111256e339c8f11', 1) ON CONFLICT(id) DO UPDATE SET type=excluded.type, parent_id=excluded.parent_id, title=excluded.title, description=excluded.description, status=excluded.status, priority=excluded.priority, assigned_to=excluded.assigned_to, team=excluded.team, decision_ref=excluded.decision_ref, updated_at=excluded.updated_at, deleted_at=excluded.deleted_at, hash=excluded.hash, canonical_version=excluded.canonical_version WHERE excluded.updated_at > tickets.updated_at OR (excluded.updated_at = tickets.updated_at AND excluded.hash > tickets.hash);