docs(phase-03): complete phase execution

.planning/ROADMAP.md

@@ -59,7 +59,7 @@ Plans:
 **Plans:** 1 plan
 
 Plans:
-- [ ] 03-01-PLAN.md -- Add SANDBOX.md generation and CLAUDE.md import management
+- [x] 03-01-PLAN.md -- Add SANDBOX.md generation and CLAUDE.md import management
 
 ## Progress
 

.planning/STATE.md

@@ -4,13 +4,13 @@ milestone: v1.0
 milestone_name: milestone
 status: executing
 stopped_at: Phase 3 context gathered
-last_updated: "2026-04-09T18:59:43.250Z"
+last_updated: "2026-04-09T19:24:16.913Z"
 last_activity: 2026-04-09
 progress:
   total_phases: 3
-  completed_phases: 2
+  completed_phases: 3
-  total_plans: 4
+  total_plans: 5
-  completed_plans: 4
+  completed_plans: 5
   percent: 100
 ---
 
@@ -25,7 +25,7 @@ See: .planning/PROJECT.md (updated 2026-04-09)
 
 ## Current Position
 
-Phase: 3 of 3 (sandbox aware prompting)
+Phase: 03 of 3 (sandbox aware prompting)
 Plan: Not started
 Status: Ready to execute
 Last activity: 2026-04-09

.planning/phases/03-sandbox-aware-prompting/03-VERIFICATION.md

@@ -0,0 +1,83 @@
+---
+phase: 03-sandbox-aware-prompting
+verified: 2026-04-09T21:30:00Z
+status: passed
+score: 4/4
+overrides_applied: 0
+---
+
+# Phase 3: Sandbox-Aware Prompting Verification Report
+
+**Phase Goal:** Claude inside the sandbox knows it is sandboxed, how to install tools, and what is unavailable
+**Verified:** 2026-04-09T21:30:00Z
+**Status:** passed
+**Re-verification:** No -- initial verification
+
+## Goal Achievement
+
+### Observable Truths
+
+| # | Truth | Status | Evidence |
+|---|-------|--------|----------|
+| 1 | Claude inside the sandbox sees SANDBOX.md content describing its environment | VERIFIED | SANDBOX.md heredoc in claudebox.sh (lines 107-143) contains all 4 sections: Sandbox Environment, Installing Tools, Default Restrictions, Git. Bind mount at line 345 maps ~/.claudebox to ~/.claude inside sandbox. |
+| 2 | CLAUDE.md in ~/.claudebox/ exists after first launch with @SANDBOX.md import on line 1 | VERIFIED | Lines 146-153: creates file with `@SANDBOX.md` if missing, prepends if first line differs. Behavioral test confirmed: first-run creates CLAUDE.md with exactly `@SANDBOX.md`. |
+| 3 | SANDBOX.md is overwritten on every launch with current content | VERIFIED | `cat >` (line 107) unconditionally writes the file on every invocation. No conditional guard -- always overwrites. |
+| 4 | Existing user content in CLAUDE.md is preserved when import line is prepended | VERIFIED | Lines 150-152: mktemp + printf + cat + mv pattern preserves existing content. Behavioral test confirmed: user content "# My custom stuff" preserved on line 2 after prepend. |
+
+**Score:** 4/4 truths verified
+
+### Required Artifacts
+
+| Artifact | Expected | Status | Details |
+|----------|----------|--------|---------|
+| `claudebox.sh` | SANDBOX.md generation and CLAUDE.md import check | VERIFIED | Lines 104-153 contain the full implementation with section comment, heredoc, and import management |
+| `~/.claudebox/SANDBOX.md` | Sandbox context for Claude Code | VERIFIED | Generated at runtime; confirmed via dry-run. Contains "bubblewrap" (line 110) |
+| `~/.claudebox/CLAUDE.md` | User-owned CLAUDE.md with managed import | VERIFIED | Generated at runtime; confirmed via dry-run. Contains "@SANDBOX.md" on line 1 |
+
+### Key Link Verification
+
+| From | To | Via | Status | Details |
+|------|----|-----|--------|---------|
+| claudebox.sh | ~/.claudebox/SANDBOX.md | heredoc write on every launch | WIRED | `cat > "$HOME/.claudebox/SANDBOX.md" << 'SANDBOXEOF'` at line 107 |
+| ~/.claudebox/CLAUDE.md | ~/.claudebox/SANDBOX.md | @SANDBOX.md import on line 1 | WIRED | `printf '%s\n' "@SANDBOX.md"` at lines 148/151 |
+| bwrap --bind ~/.claudebox ~/.claude | Claude Code session | bind mount | WIRED | `--bind "$HOME/.claudebox" "$HOME/.claude"` at line 345 (exec) and line 316 (dry-run) |
+
+### Data-Flow Trace (Level 4)
+
+Not applicable -- this phase generates static configuration files, not dynamic data rendering.
+
+### Behavioral Spot-Checks
+
+| Behavior | Command | Result | Status |
+|----------|---------|--------|--------|
+| First-run creates SANDBOX.md | `rm -f ~/.claudebox/SANDBOX.md && nix run . -- --dry-run --yes; head -1 ~/.claudebox/SANDBOX.md` | `# Sandbox Environment` | PASS |
+| First-run creates CLAUDE.md | `rm -f ~/.claudebox/CLAUDE.md && nix run . -- --dry-run --yes; cat ~/.claudebox/CLAUDE.md` | `@SANDBOX.md` | PASS |
+| Idempotency (no duplicate import) | `nix run . -- --dry-run --yes; grep -c '@SANDBOX.md' ~/.claudebox/CLAUDE.md` | `1` | PASS |
+| Prepend preserves user content | Write user content, run dry-run, check lines 1-2 | line 1: `@SANDBOX.md`, line 2: `# My custom stuff` | PASS |
+| SANDBOX.md has 3 H2 sections | `grep -c '^## ' ~/.claudebox/SANDBOX.md` | `3` | PASS |
+
+### Requirements Coverage
+
+| Requirement | Source Plan | Description | Status | Evidence |
+|-------------|------------|-------------|--------|----------|
+| AWARE-01 | 03-01-PLAN | Default CLAUDE.md created in ~/.claudebox/ on first run if not present | SATISFIED | Lines 146-148: creates file with @SANDBOX.md if not present. Behavioral test confirmed. |
+| AWARE-02 | 03-01-PLAN | Injected CLAUDE.md tells Claude about sandbox, comma/nix, and unavailable resources | SATISFIED | SANDBOX.md heredoc (lines 108-142) covers all three topics: bwrap sandbox identity, comma + nix shell installation, SSH/GPG/cloud restriction list. CLAUDE.md imports it via @SANDBOX.md. |
+
+### Anti-Patterns Found
+
+| File | Line | Pattern | Severity | Impact |
+|------|------|---------|----------|--------|
+| (none) | - | - | - | No TODOs, FIXMEs, placeholders, or stubs found |
+
+### Human Verification Required
+
+No human verification items identified. All behaviors verified programmatically via dry-run execution.
+
+### Gaps Summary
+
+No gaps found. All 4 must-have truths verified, all 3 artifacts confirmed, all 3 key links wired, both requirements (AWARE-01, AWARE-02) satisfied. Behavioral spot-checks all pass.
+
+---
+
+_Verified: 2026-04-09T21:30:00Z_
+_Verifier: Claude (gsd-verifier)_