fix(live): repo-root project labels, pending-tool liveness, subagent tailing

[pacphi]

Summary

Three live-dashboard evidence gaps made genuinely working sessions read as idle or land under phantom projects (observed on the Live tab: "No active sessions" during a 14-minute file write, and an active tub-vault session filed under a phantom scripts project):

• Repo-root project labels — resolveProjectLabel walks up from the record cwd to the nearest .git marker, so a session running from a repository subdirectory (e.g. tub-vault/scripts) files under its repository instead of a phantom project named after the subdirectory. Linked-worktree pointers keep working (now also from worktree subdirectories); retained paths that no longer exist keep the basename fallback; only a single basename is ever exposed.
• Pending-tool liveness — sweepLiveProjection holds a session active while it has a started-but-unfinished resource node (tool/mcp/skill/plugin), bounded by a new pendingExpiryMs (default 30m). Transcripts only append when a tool call finishes, so long executions previously expired the session at 5m — exactly when it looked busiest.
• Subagent transcript tailing — Claude store discovery depth 2 → 3 reaches <project>/<session>/subagents/agent-*.jsonl; those records carry the parent sessionId + agentId, so worker activity groups under the parent session and keeps it observable during delegation.

Host coverage: the label and sweep fixes live in the shared projection/service layer. Claude and Codex adapters both emit tool.started/tool.completed and resolve cwd through the same path; structured ruflo/aqe events (the OpenCode path) flow through the same reducer and sweep.

Test plan

• 4 new tests (written first, watched fail): repo-subdirectory + worktree-subdirectory label resolution, pending-window hold + close, post-completion demotion guard, nested subagent discovery grouping under the parent session with privacy assertions.
• 66/66 live tests pass; full pnpm test and pnpm run check green.
• Verified against the real local stores: probe showed tub-vault · live=1, phantom scripts project gone, 128 Claude files tailed (subagent transcripts included), zero adapter errors.

🤖 Generated with Claude Code