feat: basecamp-project skill

.pi/gsd/references/workstream-flag.md

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+# Workstream Flag (`--ws`)
+
+## Overview
+
+The `--ws <name>` flag scopes GSD operations to a specific workstream, enabling
+parallel milestone work by multiple Claude Code instances on the same codebase.
+
+## Resolution Priority
+
+1. `--ws <name>` flag (explicit, highest priority)
+2. `GSD_WORKSTREAM` environment variable (per-instance)
+3. `.planning/active-workstream` file (shared, last-writer-wins)
+4. `null` - flat mode (no workstreams)
+
+## Routing Propagation
+
+All workflow routing commands include `${GSD_WS}` which:
+- Expands to `--ws <name>` when a workstream is active
+- Expands to empty string in flat mode (backward compatible)
+
+This ensures workstream scope chains automatically through the workflow:
+`new-milestone → discuss-phase → plan-phase → execute-phase → transition`
+
+## Directory Structure
+
+```
+.planning/
+├── PROJECT.md          # Shared
+├── config.json         # Shared
+├── milestones/         # Shared
+├── codebase/           # Shared
+├── active-workstream   # Points to current ws
+└── workstreams/
+    ├── feature-a/      # Workstream A
+    │   ├── STATE.md
+    │   ├── ROADMAP.md
+    │   ├── REQUIREMENTS.md
+    │   └── phases/
+    └── feature-b/      # Workstream B
+        ├── STATE.md
+        ├── ROADMAP.md
+        ├── REQUIREMENTS.md
+        └── phases/
+```
+
+## CLI Usage
+
+```bash
+# All gsd-tools commands accept --ws
+node gsd-tools.cjs state json --ws feature-a
+node gsd-tools.cjs find-phase 3 --ws feature-b
+
+# Workstream CRUD
+node gsd-tools.cjs workstream create <name>
+node gsd-tools.cjs workstream list
+node gsd-tools.cjs workstream status <name>
+node gsd-tools.cjs workstream complete <name>
+```