docs: update meta files for S-2 session anchors

TODO.md

@@ -10,11 +10,11 @@
 - [ ] **Agent Teams real-world testing** -- Env var whitelist fix done. 3 test sessions ran ($1.10, $0.69, $1.70) but model didn't spawn subagents — needs complex multi-part prompts to trigger delegation. Test with CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS=1.
 - [ ] **Configurable stall threshold** -- health.yaml per-project config for stall threshold (currently hardcoded 15 min). Adaptive suggestions after 50 sessions from session_metrics data.
 - [ ] **Add Codex/Ollama provider runners** -- Provider adapter pattern implemented (all 3 phases). Need to create codex-runner.ts and ollama-runner.ts sidecar runners + corresponding message adapters (codex-messages.ts, ollama-messages.ts) + register providers in App.svelte.
-- [ ] **S-2 — session anchors** -- Preserve first 5 turns / 2K tokens verbatim through checkpoint chains. Pin additional turns via AST conversation tree action.
 - [ ] **Worktree isolation per project (S-1 Phase 3)** -- Three parts: (1) **UI toggle**: useWorktrees checkbox in SettingsTab per-project settings, persisted in groups.json ProjectConfig. (2) **Spawn with --worktree**: when useWorktrees=true, pass `--worktree <session-slug>` flag to Claude Code CLI via sidecar AgentQueryOptions. Sidecar creates worktree at `<cwd>/.claude/worktrees/<name>/`, agent CWD is set there. (3) **Worktree detection improvement**: current extractWorktreePath checks tool_call params, but agents don't signal worktrees in tool calls — the real signal is CWD-based (path contains `.claude/worktrees/`) or from sidecar notification events (`worktreePath`/`worktreeBranch` fields, Claude Code v2.1.72+). Update agent-dispatcher to parse init event CWD or notification fields. For Codex/Cursor agents: detect `$CODEX_HOME/worktrees/` or `~/.cursor/worktrees/` CWD patterns. Conflict suppression already works once worktree is registered via setSessionWorktree().
 
 ## Completed
 
+- [x] **S-2 — Session Anchors** -- Preserves important turns through compaction chains. Auto-anchors first 3 turns (6144 token budget, observation-masked) on first compaction event. Manual pin via AgentPane button. Promote/demote in ContextTab. Re-injection via system_prompt. Ollama context warning. 5 new files, 7 modified. 219 vitest + 42 cargo tests. | Done: 2026-03-11
 - [x] **Agent provider adapter pattern** -- Multi-provider support (Claude, Codex, Ollama) via 3-phase adapter pattern. Core abstraction (provider types/registry/capabilities, message adapter registry, file renames), Settings UI (collapsible provider panels, per-project dropdown), Sidecar routing (provider-based runner selection, env var stripping). 5 new files, 4 renames, 20+ modified. 202 vitest + 42 cargo tests. | Done: 2026-03-11
 - [x] **Files tab PDF viewer + CSV table** -- PdfViewer.svelte (pdfjs-dist 5.5.207, canvas multi-page, zoom 0.5x–3x, HiDPI). CsvTable.svelte (RFC 4180 parser, delimiter auto-detect, sortable columns, sticky header). FilesTab routing: Binary+pdf→PdfViewer, Text+csv→CsvTable. | Done: 2026-03-11
 - [x] **Filesystem Write Detection (S-1 Phase 2)** -- inotify-based file change detection via notify crate (fs_watcher.rs). Timing heuristic (2s grace) for PID attribution — suppresses agent's own writes, surfaces external edits. EXTERNAL_SESSION_ID sentinel, recordExternalWrite(), externalConflictCount. Orange "ext write" badge + red "agent conflict" badge in ProjectHeader. ProjectBox $effect starts/stops per-project. Inotify watch limit sensing: reads /proc/sys max_user_watches, counts watched dirs, warns at >75% usage with fix command. 202/202 vitest + 42/42 cargo tests. | Done: 2026-03-11
@@ -24,4 +24,3 @@
 - [x] **Context tab repurpose** -- Replaced ContextPane (ctx database viewer) with ContextTab (LLM context window visualization). Stats bar, segmented token meter, file references, turn breakdown. Tribunal debate (S-1-R4 at 82%). Token estimation via ~4 chars/token heuristic. | Done: 2026-03-10
 - [x] **CodeMirror 6 editor** -- Replaced shiki viewer in FilesTab with CodeMirror 6. CodeEditor.svelte wrapper: 15 lazy-loaded language modes, Catppuccin theme, auto-close brackets, bracket matching, code folding, Ctrl+S save, dirty tracking, save-on-blur setting. write_file_content Rust command. | Done: 2026-03-10
 - [x] **FilesTab reactivity fixes** -- Fixed HTML nesting (<button> inside <button>), Svelte 5 $state proxy reactivity for file content loading. | Done: 2026-03-10
-- [x] **Tab system overhaul** -- Renamed Claude→Model, Files→Docs. Added Files (VSCode-style tree+viewer), SSH (CRUD+launch), Memory (pluggable adapter) tabs. PERSISTED-EAGER/LAZY mount strategies. Rust list_directory_children + read_file_content commands. | Done: 2026-03-10