submit composer input via tmux server, not the detached client PTY

The composer sent input with pane.write, which writes to the PTY of the
tmux client the app spawned. That client detaches (we no longer render
or drain its PTY since T-137), leaving the session alive on the server
with no client — so keystrokes written to the dead PTY vanished and
Claude never saw the message.

Submit now goes through the tmux server: load the text into a named
paste buffer, paste it bracketed (multi-line and special chars arrive as
one block, not a stream of submits), then send Enter. Verified against a
live session — paste-buffer -p reaches Claude's input with no client
attached. The no-tmux fallback still uses pane.write (claude runs
directly in our PTY there).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.pql/changelog/ticket_history/2026-05.sql

@@ -2142,3 +2142,4 @@ Findings (2026-05-22): docs/spikes/cc-team-internals-2.1.148.md. All 5 checks an
 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-137', 'status', 'backlog', 'in_progress', NULL, '2026-05-22 17:58:07', '2026-05-22 17:58:07', '2026-05-22 17:58:07', NULL, '4e67262d4b04f8541e71fe8f03106fbf', 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-137', 'status', 'in_progress', 'done', NULL, '2026-05-22 18:14:32', '2026-05-22 18:14:32', '2026-05-22 18:14:32', NULL, 'a284c7249dda3c63a52a202bad07f105', 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-138', 'status', 'backlog', 'in_progress', NULL, '2026-05-22 21:08:05', '2026-05-22 21:08:05', '2026-05-22 21:08:05', NULL, 'c3dfefe24d912081cd89ac0be066b641', 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-138', 'status', 'in_progress', 'done', NULL, '2026-05-22 21:49:09', '2026-05-22 21:49:09', '2026-05-22 21:49:09', NULL, 'e4be02e339d638da70a4e7ce0f850691', 1) ON CONFLICT(hash) DO NOTHING;

.pql/changelog/tickets/2026-05.sql

@@ -2487,3 +2487,4 @@ Findings (2026-05-22): docs/spikes/cc-team-internals-2.1.148.md. All 5 checks an
 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-137', 'story', 'T-132', 'ConversationView + replace the terminal in the Claude pane', 'New lib/builtin/claude/src/conversation_view.dart rendering user / assistant(markdown via ClideMarkdown) / tool-call card / tool-result+diff card; whole tree under one SelectionArea. Swap ClidePtyView -> ConversationView in lib/builtin/claude/src/claude_pane.dart (~line 287). Claude still runs in tmux (detached / output ignored) but content comes from the transcript (TranscriptReader). Keep the terminal builtin + ClidePtyView for general use. Surface conversation as events too (D-6). Cite D-75. Acceptance: make run shows the native Claude conversation from the live transcript; select+copy across cards works; no terminal in the Claude pane; terminal builtin still works; widget tests. Blocked by T3, T4.', 'in_progress', 'high', NULL, NULL, NULL, '2026-05-22 15:59:34', '2026-05-22 17:58:07', NULL, 'e8244b90386314574545f0c1a7bd012c', 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-137', 'story', 'T-132', 'ConversationView + replace the terminal in the Claude pane', 'New lib/builtin/claude/src/conversation_view.dart rendering user / assistant(markdown via ClideMarkdown) / tool-call card / tool-result+diff card; whole tree under one SelectionArea. Swap ClidePtyView -> ConversationView in lib/builtin/claude/src/claude_pane.dart (~line 287). Claude still runs in tmux (detached / output ignored) but content comes from the transcript (TranscriptReader). Keep the terminal builtin + ClidePtyView for general use. Surface conversation as events too (D-6). Cite D-75. Acceptance: make run shows the native Claude conversation from the live transcript; select+copy across cards works; no terminal in the Claude pane; terminal builtin still works; widget tests. Blocked by T3, T4.', 'done', 'high', NULL, NULL, NULL, '2026-05-22 15:59:34', '2026-05-22 18:14:32', NULL, '6651a2c3c9099f7d38553f6cf9e41e98', 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-138', 'task', 'T-132', 'Native composer + file/image paste', 'New lib/builtin/claude/src/claude_composer.dart: native text field -> tmux -L clide send-keys -t <pane> (Enter submit, Shift+Enter newline). Paste text inline; file/image per the T2 spike finding (likely temp-file + path/@-reference, since send-keys carries text only). Acceptance: typing in the composer reaches Claude; pasting a text file and an image both work via the validated mechanism. Blocked by T2, T5.', 'in_progress', 'medium', NULL, NULL, NULL, '2026-05-22 15:59:34', '2026-05-22 21:08:05', NULL, '2e6b932ad78ac78d83c86c5e08290ed3', 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-138', 'task', 'T-132', 'Native composer + file/image paste', 'New lib/builtin/claude/src/claude_composer.dart: native text field -> tmux -L clide send-keys -t <pane> (Enter submit, Shift+Enter newline). Paste text inline; file/image per the T2 spike finding (likely temp-file + path/@-reference, since send-keys carries text only). Acceptance: typing in the composer reaches Claude; pasting a text file and an image both work via the validated mechanism. Blocked by T2, T5.', 'done', 'medium', NULL, NULL, NULL, '2026-05-22 15:59:34', '2026-05-22 21:49:09', NULL, '8b247ce6f9fc63c6f56030303aece2e8', 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);