feat(workflows): auto-copy learnings to global store at phase completion (#1828)

* feat(workflows): add auto-copy learnings to global store at phase completion

* fix(workflows): address review feedback for learnings auto-copy

- Replace shell-interpolated ${phase_dir} with agent context instruction
- Remove unquoted glob pattern in bash snippet
- Use gsd-tools learnings copy instead of manual file detection
- Document features.* dynamic namespace in config.cjs

* docs(config): add features.* namespace to CONFIGURATION.md schema

docs/CONFIGURATION.md

@@ -222,6 +222,29 @@ node gsd-tools.cjs config-set agent_skills.gsd-executor '["skills/my-skill"]'
 
 ---
 
+## Feature Flags
+
+Toggle optional capabilities via the `features.*` config namespace. Feature flags default to `false` (disabled) — enabling a flag opts into new behavior without affecting existing workflows.
+
+| Setting | Type | Default | Description |
+|---------|------|---------|-------------|
+| `features.thinking_partner` | boolean | `false` | Enable thinking partner analysis at workflow decision points |
+| `features.global_learnings` | boolean | `false` | Enable cross-project learnings pipeline (auto-copy at phase completion, planner injection) |
+
+### Usage
+
+```bash
+# Enable a feature
+node gsd-tools.cjs config-set features.global_learnings true
+
+# Disable a feature
+node gsd-tools.cjs config-set features.thinking_partner false
+```
+
+The `features.*` namespace is a dynamic key pattern — new feature flags can be added without modifying `VALID_CONFIG_KEYS`. Any key matching `features.<name>` is accepted by the config system.
+
+---
+
 ## Parallelization Settings
 
 | Setting | Type | Default | Description |

get-shit-done/bin/lib/config.cjs

@@ -43,6 +43,10 @@ function isValidConfigKey(keyPath) {
   if (VALID_CONFIG_KEYS.has(keyPath)) return true;
   // Allow agent_skills.<agent-type> with any agent type string
   if (/^agent_skills\.[a-zA-Z0-9_-]+$/.test(keyPath)) return true;
+  // Allow features.<feature_name> — dynamic namespace for feature flags.
+  // Intentionally open-ended so new flags (e.g., features.global_learnings) work
+  // without updating VALID_CONFIG_KEYS each time.
+  if (/^features\.[a-zA-Z0-9_]+$/.test(keyPath)) return true;
   return false;
 }
 

get-shit-done/workflows/execute-phase.md

@@ -1080,6 +1080,29 @@ node "$HOME/.claude/get-shit-done/bin/gsd-tools.cjs" commit "docs(phase-{X}): co
 ```
 </step>
 
+<step name="auto_copy_learnings">
+**Auto-copy phase learnings to global store (when enabled).**
+
+This step runs AFTER phase completion and SUMMARY.md is written. It copies any LEARNINGS.md
+entries from the completed phase to the global learnings store at `~/.gsd/knowledge/`.
+
+**Check config gate:**
+```bash
+GL_ENABLED=$(node "$HOME/.claude/get-shit-done/bin/gsd-tools.cjs" config-get features.global_learnings --raw 2>/dev/null || echo "false")
+```
+
+**If `GL_ENABLED` is not `true`:** Skip this step entirely (feature disabled by default).
+
+**If enabled:**
+
+1. Check if LEARNINGS.md exists in the phase directory (use the `phase_dir` value from init context)
+2. If found, copy to global store:
+```bash
+node "$HOME/.claude/get-shit-done/bin/gsd-tools.cjs" learnings copy 2>/dev/null || echo "⚠ Learnings copy failed — continuing"
+```
+Copy failure must NOT block phase completion.
+</step>
+
 <step name="update_project_md">
 **Evolve PROJECT.md to reflect phase completion (prevents planning document drift — #956):**