diff --git a/.planning/REQUIREMENTS.md b/.planning/REQUIREMENTS.md
index efe155d..cca64eb 100644
--- a/.planning/REQUIREMENTS.md
+++ b/.planning/REQUIREMENTS.md
@@ -9,8 +9,8 @@ Requirements for initial release. Each maps to roadmap phases.
 
 ### Session Discovery
 
-- [ ] **DISC-01**: vmux détecte automatiquement les processus Claude Code actifs sur le poste
-- [ ] **DISC-02**: vmux identifie le cwd et le worktree git de chaque session
+- [x] **DISC-01**: vmux détecte automatiquement les processus Claude Code actifs sur le poste
+- [x] **DISC-02**: vmux identifie le cwd et le worktree git de chaque session
 - [ ] **DISC-03**: vmux affiche le nom de la branche git de chaque session
 - [ ] **DISC-04**: vmux permet d'associer un label humain à une session (ex: "review MR !456")
 
@@ -66,8 +66,8 @@ Which phases cover which requirements. Updated during roadmap creation.
 
 | Requirement | Phase | Status |
 |-------------|-------|--------|
-| DISC-01 | Phase 1 | Pending |
-| DISC-02 | Phase 1 | Pending |
+| DISC-01 | Phase 1 | Complete |
+| DISC-02 | Phase 1 | Complete |
 | DISC-03 | Phase 1 | Pending |
 | DISC-04 | Phase 2 | Pending |
 | STATE-01 | Phase 1 | Pending |
diff --git a/.planning/ROADMAP.md b/.planning/ROADMAP.md
index a5d9314..1fe1fe6 100644
--- a/.planning/ROADMAP.md
+++ b/.planning/ROADMAP.md
@@ -31,7 +31,7 @@ Decimal phases appear between their surrounding integers in numeric order.
 **Plans**: 2 plans
 
 Plans:
-- [ ] 01-01-PLAN.md — Scaffolding projet Go + detection des processus Claude via /proc
+- [x] 01-01-PLAN.md — Scaffolding projet Go + detection des processus Claude via /proc
 - [ ] 01-02-PLAN.md — Parsing JSONL, heuristique d'etat et CLI vmux list
 
 ### Phase 2: Daemon et i3 Bridge
diff --git a/.planning/STATE.md b/.planning/STATE.md
index eeca2a5..daf18fa 100644
--- a/.planning/STATE.md
+++ b/.planning/STATE.md
@@ -2,16 +2,14 @@
 gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
-status: planning
-stopped_at: Phase 1 context gathered
-last_updated: "2026-03-23T11:53:05.837Z"
-last_activity: 2026-03-23 — Roadmap created
+status: Ready to execute
+stopped_at: Completed 01-01-PLAN.md
+last_updated: "2026-03-23T12:26:26.157Z"
 progress:
   total_phases: 4
   completed_phases: 0
-  total_plans: 0
-  completed_plans: 0
-  percent: 0
+  total_plans: 2
+  completed_plans: 1
 ---
 
 # Project State
@@ -21,16 +19,12 @@ progress:
 See: .planning/PROJECT.md (updated 2026-03-23)
 
 **Core value:** Savoir instantanement quelle session Claude Code a besoin de moi, sans scanner manuellement mes workspaces.
-**Current focus:** Phase 1 - Session Discovery
+**Current focus:** Phase 01 — session-discovery
 
 ## Current Position
 
-Phase: 1 of 4 (Session Discovery)
-Plan: 0 of 2 in current phase
-Status: Ready to plan
-Last activity: 2026-03-23 — Roadmap created
-
-Progress: [░░░░░░░░░░] 0%
+Phase: 01 (session-discovery) — EXECUTING
+Plan: 2 of 2
 
 ## Performance Metrics
 
@@ -52,6 +46,7 @@ Progress: [░░░░░░░░░░] 0%
 - Trend: -
 
 *Updated after each plan completion*
+| Phase 01 P01 | 2min | 2 tasks | 5 files |
 
 ## Accumulated Context
 
@@ -62,6 +57,7 @@ Recent decisions affecting current work:
 
 - Roadmap: CLI one-shot en Phase 1 (pas de daemon), daemon en Phase 2, hooks en Phase 3
 - Roadmap: 4 phases derives des 4 categories de requirements
+- [Phase 01]: procDir injectable pour testabilite (pas de /proc en dur)
 
 ### Pending Todos
 
@@ -73,6 +69,6 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-03-23T11:53:05.835Z
-Stopped at: Phase 1 context gathered
-Resume file: .planning/phases/01-session-discovery/01-CONTEXT.md
+Last session: 2026-03-23T12:26:26.155Z
+Stopped at: Completed 01-01-PLAN.md
+Resume file: None
diff --git a/.planning/phases/01-session-discovery/01-01-SUMMARY.md b/.planning/phases/01-session-discovery/01-01-SUMMARY.md
new file mode 100644
index 0000000..503ad5c
--- /dev/null
+++ b/.planning/phases/01-session-discovery/01-01-SUMMARY.md
@@ -0,0 +1,91 @@
+---
+phase: 01-session-discovery
+plan: 01
+subsystem: process-detection
+tags: [go, proc, linux, cli]
+
+requires: []
+provides:
+  - "Go module scaffold (shell.nix, go.mod)"
+  - "Shared types: Process, Session, SessionState"
+  - "FindClaudeProcesses() scanning /proc for Claude PIDs"
+  - "EncodePath() converting absolute paths to ~/.claude/projects/ folder names"
+affects: [01-02, 02-session-state]
+
+tech-stack:
+  added: [go-1.25, go-stdlib-os]
+  patterns: [injectable-procdir-for-testing, fake-proc-fixtures]
+
+key-files:
+  created: [shell.nix, go.mod, types.go, proc.go, proc_test.go]
+  modified: []
+
+key-decisions:
+  - "filepath.Base matching for Claude binary detection (handles full paths)"
+  - "procDir parameter injection for testability (no hardcoded /proc)"
+
+patterns-established:
+  - "Fake /proc fixtures: createFakeProc() builds temp dirs with cmdline files and cwd symlinks"
+  - "Silent error skipping: permission denied and vanished processes are skipped, not fatal"
+
+requirements-completed: [DISC-01, DISC-02]
+
+duration: 2min
+completed: 2026-03-23
+---
+
+# Phase 01 Plan 01: Scaffolding + Process Detection Summary
+
+**Go module with FindClaudeProcesses() scanning /proc for active Claude Code PIDs and EncodePath() for session folder mapping**
+
+## Performance
+
+- **Duration:** 2 min
+- **Started:** 2026-03-23T12:23:44Z
+- **Completed:** 2026-03-23T12:25:44Z
+- **Tasks:** 2
+- **Files created:** 5
+
+## Accomplishments
+- Go project scaffolded with NixOS shell.nix, go.mod, and shared types (Process, Session, SessionState)
+- FindClaudeProcesses() scans configurable /proc directory, filters by "claude" binary name, reads cwd via Readlink
+- EncodePath() converts paths to ~/.claude/projects/ folder format (replace / and . with -)
+- 5 tests covering normal detection, permission denied, empty proc, and path encoding edge cases
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Scaffolding projet + types partages** - `12e1ba7` (feat)
+2. **Task 2 RED: Failing tests for proc scanning** - `81ee7dc` (test)
+3. **Task 2 GREEN: Implement FindClaudeProcesses and EncodePath** - `166e441` (feat)
+
+## Files Created/Modified
+- `shell.nix` - NixOS dev environment with go and gopls
+- `go.mod` - Go module github.com/pieMusic/vmux
+- `types.go` - Shared types: Process, Session, SessionState (Working/NeedsInput/Idle/Unknown)
+- `proc.go` - FindClaudeProcesses() and EncodePath()
+- `proc_test.go` - 5 unit tests with fake /proc fixtures
+
+## Decisions Made
+- Used `filepath.Base(parts[0])` for binary detection to handle full paths like `/nix/store/.../claude`
+- Injected procDir as parameter for full testability without mocking os functions
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+- shell.nix was in Pierre's global gitignore; force-added with `git add -f` since it is project-specific
+
+## User Setup Required
+
+None - no external service configuration required.
+
+## Next Phase Readiness
+- Types and process detection ready for plan 01-02 (JSONL session matching, state heuristics, display)
+- EncodePath enables PID-to-session folder mapping
+
+---
+*Phase: 01-session-discovery*
+*Completed: 2026-03-23*