feat(coding-agent): recursive scoped agents view

[snimu]

The agents view used to be one flat list of top-level sessions. Now that agents can have children and grandchildren, you can navigate the tree:

• Press Right on a session to drill into its children; Left goes back up one level.
• The header shows where you are, and each chat shows its own depth next to the model name.
• Selecting a child opens it directly as a normal chat — including children that are currently unloaded (they wake up on demand).
• If a subtree disappears while you're inside it (say the sessions got deleted), the view walks you back up to the nearest level that still exists instead of getting stuck.

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This is part 1–7 of a stack (each PR builds on the one before it):

1. feat(coding-agent): lazy child session hydration #583 — don't load finished subagents until someone needs them
2. feat(coding-agent): persist parent edges and derived depth for all sessions #584 — record each session's parent and depth on disk
3. feat(coding-agent): /rlm-max-depth session command #585 — new /rlm-max-depth command to control how deep agents can nest
4. feat(coding-agent): recursive scoped agents view #586 — browse the agent tree in the agents view
5. feat(coding-agent): delete child-agent inspector; one subagent summary line #587 — replace the child-agent inspector with one summary line
6. feat(coding-agent): whole-tree idle eviction #588 — shut down worker processes whose sessions have all gone idle
7. feat(coding-agent): intra-tree child session passivation #589 — quietly unload idle child sessions inside a running worker

Tests: the full suite at the top of the stack fails only on tests that already fail on the base branch. Each branch in the stack also passes checks and its own tests independently.

Note

Add recursive scoped agents view with scope stack navigation and subtree filtering

• Introduces a scope stack to the agents view so users can drill into a session's subtree and navigate back, replacing the previous in-session subagent detail panel with a full scoped agents view.
• AgentsViewMode now filters and renders only the subtree rooted at the current scope, promotes direct children of the scope root to depth-0 agent rows, and gracefully falls back to the nearest available ancestor when the scoped root is missing.
• InteractiveMode routes child-agent tray interactions to openScopedAgentsView() instead of openChildAgentDetail(), and the run result can now be 'scoped_agents_view' to signal scoped re-entry.
• Scope frames, last successful live summaries, and selection state are persisted across chat returns so the view restores correctly after transient refresh failures.
• formatAgentDepthLabel adds a depth indicator to the chat tray location label when session depth and children hints are available.
• Risk: initialSubagentNodeId and enteredSessionViaSubagentDetail are removed; callers relying on auto-opening a subagent detail panel on startup will no longer see that behavior.

^{Macroscope summarized 05ba353.}

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Note

Medium Risk
Large TUI navigation refactor removes startup subagent detail auto-open and changes agents-view/chat handoff; scope and catalog reconciliation bugs could mis-route users or drop selection after daemon refresh.

Overview
Introduces recursive scoped navigation in the agents view: a scope stack filters the unified catalog to a session’s subtree, Right drills into children, Left pops to the parent scope (or reopens the recorded return chat), and the splash shows scope and depth.

InteractiveMode no longer auto-opens initialSubagentNodeId or the full-screen subagent detail panel; the child-agent tray now calls openScopedAgentsView(), and exiting chat can return scoped_agents_view so main re-enters the agents view rooted at that session. Chat passes sessionDepth / sessionHasChildren for tray depth labels via formatAgentDepthLabel.

agents-view-state gains unified indexing, subtree scoping, scope-frame resolution/fallback when roots vanish, saved-session parent links, unattachable-child open fallback, and direct children promoted to top-level rows inside a scope.

Resilience: cached lastSuccessfulLiveSummaries, live/saved catalog-ready gates before dropping invalid scopes, combined startup notices, and reconnect no longer clears the list to empty on timeout.

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