feat: basecamp-project skill

.pi/gsd/references/phase-argument-parsing.md

@@ -0,0 +1,61 @@
+# Phase Argument Parsing
+
+Parse and normalize phase arguments for commands that operate on phases.
+
+## Extraction
+
+From `$ARGUMENTS`:
+- Extract phase number (first numeric argument)
+- Extract flags (prefixed with `--`)
+- Remaining text is description (for insert/add commands)
+
+## Using gsd-tools
+
+The `find-phase` command handles normalization and validation in one step:
+
+```bash
+PHASE_INFO=$(node ".pi/gsd/bin/gsd-tools.cjs" find-phase "${PHASE}")
+```
+
+Returns JSON with:
+- `found`: true/false
+- `directory`: Full path to phase directory
+- `phase_number`: Normalized number (e.g., "06", "06.1")
+- `phase_name`: Name portion (e.g., "foundation")
+- `plans`: Array of PLAN.md files
+- `summaries`: Array of SUMMARY.md files
+
+## Manual Normalization (Legacy)
+
+Zero-pad integer phases to 2 digits. Preserve decimal suffixes.
+
+```bash
+# Normalize phase number
+if [[ "$PHASE" =~ ^[0-9]+$ ]]; then
+  # Integer: 8 → 08
+  PHASE=$(printf "%02d" "$PHASE")
+elif [[ "$PHASE" =~ ^([0-9]+)\.([0-9]+)$ ]]; then
+  # Decimal: 2.1 → 02.1
+  PHASE=$(printf "%02d.%s" "${BASH_REMATCH[1]}" "${BASH_REMATCH[2]}")
+fi
+```
+
+## Validation
+
+Use `roadmap get-phase` to validate phase exists:
+
+```bash
+PHASE_CHECK=$(node ".pi/gsd/bin/gsd-tools.cjs" roadmap get-phase "${PHASE}" --pick found)
+if [ "$PHASE_CHECK" = "false" ]; then
+  echo "ERROR: Phase ${PHASE} not found in roadmap"
+  exit 1
+fi
+```
+
+## Directory Lookup
+
+Use `find-phase` for directory lookup:
+
+```bash
+PHASE_DIR=$(node ".pi/gsd/bin/gsd-tools.cjs" find-phase "${PHASE}" --raw)
+```