build: add make regen-all (Phase 1 of living-docs regen automation) (#61)

Single command to flush every generated artifact a PR can drift:
- regen-templates: attune-author regenerate against root .help/ corpus
- build-editor: existing Vite bundle build

regen-all = regen-templates + build-editor.

Scope per docs/specs/living-docs-regen-automation/ Phase 1:
- Root corpus only (sidecar/.help/ has been unmaintained; deferred).
- Default polish path (matches current practice; Anthropic cost is real).
- No CI hook yet — that's Phase 2.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

Author: silversurfer562

Makefile

@@ -7,6 +7,7 @@ EDITOR_FRONTEND := editor-frontend
 EDITOR_OUTPUT := sidecar/attune_gui/static/editor
 
 .PHONY: build-editor lint-editor typecheck-editor dev-editor test-editor clean-editor install-editor
+.PHONY: regen-templates regen-all
 
 install-editor:
 	cd $(EDITOR_FRONTEND) && npm install
@@ -32,3 +33,17 @@ dev-editor:
 clean-editor:
 	rm -rf $(EDITOR_OUTPUT)
 	rm -rf $(EDITOR_FRONTEND)/node_modules
+
+# Regenerate living-docs templates for the root .help/ corpus.
+# Calls Anthropic for polish — costs $$ on stale features.
+# Sidecar corpus (sidecar/.help/) is deferred and not maintained here;
+# see docs/specs/living-docs-regen-automation/ for the rationale.
+regen-templates:
+	uv run attune-author regenerate --help-dir .help
+
+# Single command to flush every generated artifact a PR can drift:
+# living-docs templates + editor bundle. Run before pushing source
+# changes to sidecar/** or editor-frontend/src/**.
+regen-all: regen-templates build-editor
+	@echo ""
+	@echo "regen-all complete. Verify with: git status"