docs: update meta files for S-2 session anchors

.claude/CLAUDE.md

@@ -58,6 +58,7 @@
 - tool-files.ts utility: shared extractFilePaths(tc) → ToolFileRef[], extractWritePaths(tc) → string[], extractWorktreePath(tc) → string|null. Bash write detection via regex (>, >>, sed -i, tee, cp, mv). Used by ContextTab (all ops) and agent-dispatcher (writes + worktree tracking for conflict detection).
 - ProjectHeader shows status dot (green pulse=running, gray=idle, orange pulse=stalled, dim=inactive) + external write badge (orange ⚡ clickable, shown when externalConflictCount > 0) + agent conflict badge (red ⚠ clickable with ✕) + context pressure badge (>90% red, >75% orange, >50% yellow) + burn rate badge ($/hr). Health prop from ProjectBox via getProjectHealth(). ProjectBox starts/stops fs watcher per project CWD via $effect.
 - session_metrics SQLite table: per-project historical session data (project_id, session_id, timestamps, peak_tokens, turn_count, tool_call_count, cost_usd, model, status, error_message). 100-row retention per project. Tauri commands: session_metric_save, session_metrics_load. Persisted on agent completion via agent-dispatcher.
+- Session anchors (S-2): Preserves important turns through compaction chains. Types: auto (on first compaction, 3 turns, 6144 token budget, observation-masked), pinned (user-created via pin button in AgentPane), promoted (user-promoted from pinned, re-injectable). Re-injection: anchors.svelte.ts → AgentPane.startQuery() → system_prompt field → sidecar → SDK. ContextTab shows anchor section with budget meter + promote/demote. SQLite: session_anchors table. Files: types/anchors.ts, adapters/anchors-bridge.ts, stores/anchors.svelte.ts, utils/anchor-serializer.ts. Ollama warning toast when injecting anchors with potentially small context window.
 - Agent tree (AgentTree.svelte) uses SVG with recursive layout. Tree data built by `agent-tree.ts` utility from agent messages.
 - ctx integration opens `~/.claude-context/context.db` as SQLITE_OPEN_READ_ONLY — never writes. CtxDb uses Option<Connection> for graceful absence if DB doesn't exist.
 - SSH sessions spawn TerminalPane with shell=/usr/bin/ssh and args array. No SSH library needed — PTY handles it natively.