Lock the right pane while focused, add project focus, quiet lead

docs/operations.md

@@ -100,7 +100,7 @@ Agent activity becomes events with `agent_session_id` set: `user.message`, `agen
 
 Messages byre itself sends an agent (actor `byre`: the restart notice, Sync and Merge prompts, Compact's handoff request and the continuation's handoff) show collapsed like a tool call, labelled `byre` with the first line as the brief; expanding it shows the full text. The transcript view has an accent border while the session is `running`, and a braille spinner on its last line, cycling ⠋⠙⠹⠸⠼⠴⠦⠧⠇⠏ every 0.8s. It is one element with one CSS animation: the ten frames are drawn side by side in an inline SVG used as the `.spinner` mask over an accent background, and the `braille` keyframes in `web/style.css` step the mask position through them. Orion freezes animated GIFs and per-dot `step-end` opacity animations partway through a turn, so it stays a single element with a single animation. Consecutive tool calls (with any thinking between them) collapse into one group whose summary counts calls per tool and file, and file paths show relative to the worktree. A turn's final message that is at least half visible in the transcript while the page is visible dismisses its `report` inbox item, as the viewing user. Selecting a task that has never had a session focuses the composer. In the composer, Enter sends and Shift-Enter adds a newline; unsent text is kept per task in memory, so it survives switching tabs or tasks but not a page reload. The composer is the same whether or not the task has a live session: Send posts to the session's messages, or starts a session with the text when there is none or the last one completed. A sent message shows at once as a "sending…" bubble, replaced by the server's `user.message` event with the same text when it arrives, and removed (text and images back in the composer) if the request fails.
 
-The task switcher (⌘K, or the navbar crumb) lists active tasks with their session state and open inbox item count, live while it is open. Tasks with inbox items come first; within each group, the task least recently visited in this browser comes first (never-visited tasks before all others, ties in the server's order: projects by name, tasks newest first). Visit times are kept in the browser's localStorage under `byre.visits`, stamped when a task is selected and again when it is left. Typing filters them and adds a last row that creates a task with the typed text as its title, in the current task's project (the first project when no task is selected); Enter picks the highlighted row. Picking a task points the right pane at it on the Transcript tab (see "Lead agent").
+The task switcher (⌘K, or the navbar crumb) lists active tasks with their session state and open inbox item count, live while it is open. Tasks with inbox items come first; within each group, the task least recently visited in this browser comes first (never-visited tasks before all others, ties in the server's order: projects by name, tasks newest first). Visit times are kept in the browser's localStorage under `byre.visits`, stamped when a task is selected and again when it is left. After the tasks come the projects, one row each for its `TODO.md`; picking one points the right pane at the project with no task, on the Todo tab. Typing filters both and adds a last row that creates a task with the typed text as its title, in the right pane's project (the first project when there is none); Enter picks the highlighted row. Picking a task points the right pane at it on the Transcript tab (see "Lead agent").
 
 ## Lead agent
 
@@ -108,13 +108,14 @@ Each user has one long-running lead agent, shown in the left pane. It is not tie
 
 - **Sessions.** A lead session is an `agent_sessions` row with `owner` set to the user's login, `role` `lead` and no `task_id`. Its events carry `owner` and no project or task. It runs in `leads/<login>` with `leadGuidance` (passed and re-attached the same way as a task agent's guidance) and the lead tools instead of the task tools. It has no Stop-hook bounce, no snapshots, no end-of-turn commit and no inbox report; a turn that ends in error records the error on its `session.state` event, which the pane shows as a note. Its turns don't count against the caps.
 - **Messages.** `POST /api/me/lead/messages` sends the caller's message to their lead, starting a lead session when there is none. While the lead is mid-turn the message is held in `lead_inputs` and becomes its next turn; the composer stays enabled. `GET /api/me/lead/sessions` lists the caller's lead sessions; interrupt and compact use the usual session endpoints.
-- **Signals.** Every published event goes through `Manager.Observe`. These become signals in `lead_inputs` for every user who has a lead session: `inbox.created` (a question with its choices and recommendation, a report's text cut to 1500 characters, an error or rate limit), `inbox.updated` when a human answered a question or error, `task.merged` and `task.discarded`. `focus.updated` signals only its owner's lead. A signal caused by the lead itself (actor `<login> (lead)`) is skipped, as is the update from an answer it gave. Whenever the lead is idle, byre sends the oldest held message from the human as its own turn, or else every held signal as one `byre` message headed "Signals since your last turn (n)".
+- **Signals.** Every published event goes through `Manager.Observe`. These become signals in `lead_inputs` for every user who has a lead session: `inbox.created` (a question with its choices and recommendation, a report's text cut to 1500 characters, an error or rate limit), `inbox.updated` when a human answered a question or error, `task.merged` and `task.discarded`. The human switching the right pane is not a signal. A signal caused by the lead itself (actor `<login> (lead)`) is skipped, as is the update from an answer it gave. Whenever the lead is idle, byre sends the oldest held message from the human as its own turn, or else every held signal as one `byre` message headed "Signals since your last turn (n)". Its guidance tells it not to respond to the human's own actions, and to make its final message exactly `NO_REPLY` when a batch needs nothing from it. A transcript (`quietReply` in `web/src/task.ts`) never draws an `agent.message` that is exactly `NO_REPLY`, hides the live partial message while its text is still a prefix of it, and when that turn ends folds it into one collapsed row, "byre <the turn's first line> · nothing to say", that expands to the signals and anything the lead did.
 - **Tools.** `list_tasks`, `read_transcript` (a task's events in brief, the last `limit` or those after `after_seq`), `read_inbox`, `answer_question` (an `option`, `other` or `dismiss` response recorded as the user, through the same checks as `POST /api/inbox/responses`), `send_message` (starts the task's agent if it has none; refused while it is mid-turn), `create_task`, `start_todo`, `interrupt`, `compact_task`, `merge_task`, `discard_task`, `show` and `compact_self`. The lead also has Claude Code's own tools and reads worktrees by path. Messages it sends task agents have actor `<login> (lead)`, so they don't make the user a participant; tasks, merges, discards and answers are done as the user. Its guidance says to answer a question only when the answer is clear or the human gave it, and to merge or discard only when the human asks.
-- **Focus.** `users.focus` holds what the user's right pane shows: `task_id`, `tabs` (the tabs put first, in order) and `tab` (the selected one). `GET /api/me/focus` reads it; `PUT /api/me/focus` and the lead's `show` set it, refusing an unknown tab or a task that isn't active, and record a `focus.updated` event owned by the user. The page applies the focus on load and on every `focus.updated` it didn't cause itself; the human's own changes (⌘K, the navbar crumb, clicking a tab, a task link, a notification) are sent with `PUT /api/me/focus`, which signals the lead.
+- **Focus.** `users.focus` holds what the user's right pane shows: `project_id`, `task_id`, `tabs` (the tabs put first, in order) and `tab` (the selected one). With a `task_id`, `project_id` is always that task's project, filled in by the server; with only a `project_id`, the pane shows that project with no task, which only the Todo tab has anything for. `GET /api/me/focus` reads it; `PUT /api/me/focus` and the lead's `show` set it, refusing an unknown tab, a task that isn't active or an unknown project, and record a `focus.updated` event owned by the user. The page applies the focus on load and on every `focus.updated` it didn't cause itself; the human's own changes (⌘K, the navbar crumb, clicking a tab, a task link, a notification) are sent with `PUT /api/me/focus`. The URL follows the focus: `#/task/<id>`, `#/project/<id>`, or `#/` for neither.
+- **Pane lock.** While the human is working in the right pane, the lead's `show` is refused with an error telling it to say in chat what it would have shown. The page sends `PUT /api/me/pane-focus` with `focused` whenever that changes: true while the browser window has focus and the focused element is inside the right pane. The pane itself is focusable (`tabIndex` -1), so a click anywhere in it counts, not only on inputs and buttons; a re-render that removes the focused element hands focus back to the pane rather than counting as leaving. The page sends false on `pagehide` (with `keepalive`) and resends true when its event stream reconnects. byre keeps the flag in memory per user (`Manager.paneFocused`), so it starts false after a restart until the page resends it.
 - **Compaction.** The pane's **Compact** button asks the lead for a handoff (`leadHandoffPrompt`). The lead can also call `compact_self` at a logical point; when that turn ends normally, byre sends the same request. The handoff turn ends the session, and a new lead session starts from `leadHandoffPreamble` plus the handoff; held input follows once that turn ends.
 - **Restarts.** On shutdown, byre marks each running lead session idle with "byre stopped mid-turn" and holds a restart notice for it, so a lead is never left `running` for a build without lead support to find. After a crash, startup resumes a running lead like a task session. Startup then delivers any held input.
 
-The UI is two panes: the left is the lead's transcript and composer (the same view as a task transcript, with only the Compact button in its header), the right shows the focused task with the Transcript, Changes, Files, Inbox and Todo tabs, the lead's `tabs` first.
+The UI is two panes: the left is the lead's transcript and composer (the same view as a task transcript, with only the Compact button in its header), the right shows the focused task, or project with no task, with the Transcript, Changes, Files, Inbox and Todo tabs, the lead's `tabs` first.
 
 ## Todo
 
@@ -122,7 +123,7 @@ A project's `TODO.md` is read from the root of its default branch in the project
 
 The title is the item's identity. `POST /api/projects/{id}/todo/tasks` with a `title` re-reads `TODO.md`, refuses an unknown title (404) or one an active task already has (409), creates a task from the default branch with that title and `todo_item` (the `tasks.todo_item` column, empty for other tasks), and starts its session as the requesting user with `todoPrompt` (`internal/agents/tasks.go`): the item as written, and an instruction to remove it from `TODO.md` in the worktree when the work is done. The agent's guidance names the item too (`taskGuidance`, see "Agent sessions"), so the instruction survives compaction and resumes. The agent removes the item on its own branch, so the removal lands on the default branch in the same squash commit as the work.
 
-The **Todo** tab lists the items of the selected task's project, grouped by section, with each body rendered as Markdown. An item with an active task whose `todo_item` equals its title shows that task's session state as a link to the task instead of a **Start** button. **Start** posts the item with the composer's default model and points the right pane at the new task's transcript. The tab fetches the project's `TODO.md` when it opens, when the selected task moves to another project, when the project list changes, when the SSE stream reconnects, and on `task.merged`; a change pushed to the default branch outside byre shows the next time one of those happens.
+The **Todo** tab lists the items of the right pane's project (the focused task's, or the project focused with no task), grouped by section, with each body rendered as Markdown. An item with an active task whose `todo_item` equals its title shows that task's session state as a link to the task instead of a **Start** button. **Start** posts the item with the composer's default model and points the right pane at the new task's transcript. The tab fetches the project's `TODO.md` when it opens, when the right pane moves to another project, when the project list changes, when the SSE stream reconnects, and on `task.merged`; a change pushed to the default branch outside byre shows the next time one of those happens.
 
 ## Inbox