feat: unify bmad-build onto the shared snapshot renderer with a customizable defer sink

package.json

@@ -40,14 +40,13 @@
     "lint:fix": "eslint . --ext .js,.cjs,.mjs,.yaml --fix",
     "lint:md": "markdownlint-cli2 \"**/*.md\"",
     "prepare": "command -v husky >/dev/null 2>&1 && husky || exit 0",
-    "quality": "npm run format:check && npm run lint && npm run lint:md && npm run docs:build && npm run test:site-url && npm run test:install && npm run test:urls && npm run test:renderer && npm run test:retrospective && npm run test:build-auto-contract && npm run validate:refs && npm run validate:skills && npm run docs:validate-sidebar",
+    "quality": "npm run format:check && npm run lint && npm run lint:md && npm run docs:build && npm run test:site-url && npm run test:install && npm run test:urls && npm run test:renderer && npm run test:retrospective && npm run validate:refs && npm run validate:skills && npm run docs:validate-sidebar",
     "rebundle": "node tools/installer/bundlers/bundle-web.js rebundle",
-    "test": "npm run test:refs && npm run test:install && npm run test:urls && npm run test:site-url && npm run test:channels && npm run test:renderer && npm run test:retrospective && npm run test:build-auto-contract && npm run test:skills && npm run lint && npm run lint:md && npm run format:check",
-    "test:build-auto-contract": "node test/test-build-auto-contract.js",
+    "test": "npm run test:refs && npm run test:install && npm run test:urls && npm run test:site-url && npm run test:channels && npm run test:renderer && npm run test:retrospective && npm run test:skills && npm run lint && npm run lint:md && npm run format:check",
     "test:channels": "node test/test-installer-channels.js",
     "test:install": "node test/test-installation-components.js",
     "test:refs": "node test/test-file-refs-csv.js",
-    "test:renderer": "uv run --python 3.11 python -m unittest src/scripts/tests/test_config_utils.py src/scripts/tests/test_resolve_config.py src/scripts/tests/test_resolve_customization.py && node test/test-build-renderer.js && node test/test-build-auto-renderer.js",
+    "test:renderer": "uv run --python 3.11 python -m unittest src/scripts/tests/test_config_utils.py src/scripts/tests/test_resolve_config.py src/scripts/tests/test_resolve_customization.py && node test/test-build-auto-renderer.js",
     "test:retrospective": "uv run --python 3.11 src/bmm-skills/ship/bmad-retrospective/scripts/tests/test_git_evidence.py && uv run --python 3.11 src/bmm-skills/ship/bmad-retrospective/scripts/tests/test_sprint_status.py",
     "test:site-url": "node test/test-site-url.mjs",
     "test:skills": "node test/test-validate-skills.js",

src/bmm-skills/ship/bmad-build-auto/SKILL.md

@@ -3,7 +3,7 @@ name: bmad-build-auto
 description: 'One iteration of an unattended development loop. Use when invoked by name.'
 ---
 
-Run this single command exactly once, substituting the absolute project and skill roots without changing the working directory:
+Run the following command exactly once without changing the current working directory. Replace `{project-root}` with the absolute path to the project root and `{skill-root}` with the absolute path to this skill's directory:
 
 ```bash
 uv run --no-cache "{project-root}/_bmad/scripts/render_skill.py" --project-root "{project-root}" --skill "{skill-root}"

src/bmm-skills/ship/bmad-build/SKILL.md

@@ -3,11 +3,11 @@ name: bmad-build
 description: 'Implements any user intent, requirement, story, bug fix or change request by producing clean working code artifacts that follow the project''s existing architecture, patterns and conventions. Use when the user wants to build, fix, tweak, refactor, add or modify any code, component or feature.'
 ---
 
-Run this, substituting `{skill-root}` with the absolute path to this skill's base directory, without changing the cwd:
+Run the following command exactly once without changing the current working directory. Replace `{project-root}` with the absolute path to the project root and `{skill-root}` with the absolute path to this skill's directory:
 
 ```bash
-uv run --no-cache {skill-root}/render.py
+uv run --no-cache "{project-root}/_bmad/scripts/render_skill.py" --project-root "{project-root}" --skill "{skill-root}"
 ```
 
-- **On success:** follow the instruction it prints to stdout; ignore stderr.
-- **On any failure** (including `uv` not being installed): report what it printed and HALT.
+- On success, read and follow the one absolute `workflow.md` instruction printed to stdout.
+- On failure (including `uv` being unavailable), report the command output and HALT. Do not run any workflow source directly.