route editor config through a source-agnostic EditorSettings model (T-29)

Introduce EditorSettings as the effective, source-agnostic editor configuration
the editor and save path obey. .editorconfig is demoted to one *source*
(editorconfig.dart now returns EditorSettings); editor_settings_resolver.dart is
the single composition seam where future sources — a settings panel, a clide
settings file — layer in via merge() without the editor changing.

The registry resolves settings on buffer load and, when a .editorconfig is saved
in-app, re-resolves every open buffer and emits editor.settings-changed (a hook
in save, not a filesystem watcher — the realistic case, cheaply). Buffer JSON
carries editorSettings. 100% line coverage on the new model + resolver.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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

@@ -2403,3 +2403,5 @@ Repro: open the composer, type ''/'' then a command fragment; (a) include a ''-'
 
 Acceptance: ''-'' is treated as a normal command-name character (suggestions keep filtering through hyphens); Tab reliably completes the highlighted suggestion every time (insert via completeSlash). Add/extend unit tests in slash_commands_test.dart for hyphenated queries and a composer widget test for Tab-accept.', 'ready', 'medium', NULL, NULL, NULL, '2026-06-08 09:20:00', '2026-06-09 06:33:31', NULL, 'f3d2e1c7b6efdaf6bc426282cf3275dc', 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-29', 'story', 'T-4', 'editor respects .editorconfig settings', 'When a file is opened in the editor, read .editorconfig from the workspace root and apply: indent_style, indent_size, max_line_length (ruler/wrap guide), end_of_line, trim_trailing_whitespace, insert_final_newline. Parse the INI format ourselves (small, no dep). Glob matching per the EditorConfig spec.', 'in_progress', 'medium', NULL, NULL, NULL, '2026-04-22 20:17:26', '2026-06-09 06:34:31', NULL, '9c6056aa6b5b5eabf0df7792c6c636f6', 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-290', 'story', 'T-8', 'Edit editor settings (.editorconfig) from the settings panel', 'Write path for editor settings (T-29 follow-up). The editor now READS .editorconfig into a source-agnostic EditorSettings model (lib/src/editor/editor_settings.dart) and resolves it via editor_settings_resolver.dart. Add a settings-panel surface to EDIT these values and persist them — initially by writing the project .editorconfig (indent_style/size, end_of_line, max_line_length, trim_trailing_whitespace, insert_final_newline), later possibly a clide-owned settings file that merges as a higher-precedence source in resolveEditorSettings. On save the registry already re-resolves open buffers (editor.settings-changed), so the panel edits apply live. Respect EditorConfig semantics (sections/globs); start with the [*] section for the workspace defaults. Refs: T-29, D-88, editor_settings.dart, editor_settings_resolver.dart.', 'backlog', 'medium', NULL, NULL, 'D-88', '2026-06-09 07:15:14', '2026-06-09 07:15:14', NULL, '54bd063a8718b263a316cfac4f23b40e', 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-291', 'task', 'T-8', 'Re-resolve .editorconfig on external file changes (fs-watch)', 'T-29 follow-up. Today open buffers re-resolve their EditorSettings when a .editorconfig is saved IN-APP (a hook in EditorRegistry.save → editor.settings-changed). External edits — another editor, a git checkout/branch switch — are NOT picked up until reopen. Wire a filesystem watch so an external .editorconfig change re-resolves open buffers too. Prefer piggybacking the files subsystem''s existing watcher over a new dedicated watch; debounce; only re-resolve buffers under the changed config''s directory. Rare case, hence deferred from the initial T-29 work (the in-app save hook covers the common path). Refs: T-29, lib/src/editor/editor_settings_resolver.dart, EditorRegistry._reresolveSettings.', 'backlog', 'low', NULL, NULL, NULL, '2026-06-09 07:15:22', '2026-06-09 07:15:22', NULL, '032edf9cabf61178afb7d324e3273511', 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);