docs: update progress log and documentation index

Add Phase 1 completion details to progress.md and document index
table to docs/README.md linking all planning documents.

docs/README.md

@@ -11,3 +11,12 @@ description: "Project documentation index"
 Project documentation lives here.
 
 > This directory is maintained automatically. When features are added or changed, corresponding documentation is updated.
+
+## Index
+
+| Document | Description |
+|----------|-------------|
+| [task_plan.md](task_plan.md) | v2 architecture decisions, error handling, testing strategy |
+| [phases.md](phases.md) | v2 implementation phases (1-6) with checklists |
+| [findings.md](findings.md) | Research findings (Agent SDK, Tauri, xterm.js, performance) |
+| [progress.md](progress.md) | Session-by-session progress log |

docs/progress.md

@@ -31,7 +31,17 @@
 - [x] Defined MVP boundary (Phases 1-4)
 - [x] Added responsive layout requirement (1920px degraded mode)
 
+### Phase 1 Scaffolding (complete)
+- [x] Created feature branch `v2-mission-control`
+- [x] Initialized Tauri 2.x + Svelte 5 project in `v2/` directory
+- [x] Rust backend stubs: main.rs, lib.rs, pty.rs, sidecar.rs, watcher.rs, session.rs
+- [x] Svelte frontend: App.svelte with Catppuccin Mocha CSS variables, component stubs
+- [x] Node.js sidecar scaffold: agent-runner.ts with NDJSON communication pattern
+- [x] Tauri builds and launches (cargo build --release verified)
+- [x] Dev scripts: npm run dev, npm run build, npm run tauri dev/build
+- [x] 17 operational rules added to `.claude/rules/`
+- [x] Project meta files: CLAUDE.md, .claude/CLAUDE.md, TODO.md, CHANGELOG.md
+- [x] Documentation structure: docs/README.md, task_plan.md, phases.md, findings.md, progress.md
+
 ### Next Steps
-- [ ] Present plan to user for review and decision
-- [ ] Create feature branch
-- [ ] Begin Phase 1: Project scaffolding
+- [ ] Begin Phase 2: Terminal Pane + Layout (CSS Grid, xterm.js, PTY)