perf(coding-agent): optimized documentation indexing via compressed blob

- Replaced raw TypeScript documentation map with a lazily-inflated gzip blob.
- Reduced bundled binary/npm package size by approximately 0.9MB.
- Encapsulated index logic into `docs-index.ts` to separate header metadata from content.
- Added `postpack` and robust `try/finally` patterns in build scripts to ensure clean artifacts.
- Implemented disk-based fallback during development to maintain existing developer experience.

packages/coding-agent/scripts/bundle-dist.ts

@@ -19,8 +19,8 @@ const ALWAYS_EXTERNAL = ["mupdf", "@oh-my-pi/pi-natives", "@huggingface/transfor
 // redundant copy that bloats dist/cli.js. NEVER add a patched dependency here — the
 // bundle is where a root `patchedDependencies` patch is baked in, so an externalized
 // import would load the unpatched npm package in users' installs (currently
-// beautiful-mermaid and @ark/schema are patched, so they — and arktype, which pulls
-// @ark/schema — stay bundled).
+// @ark/schema is patched, so it — and arktype, which pulls @ark/schema — stay
+// bundled).
 const RUNTIME_EXTERNAL = [
 	"puppeteer-core",
 	"@puppeteer/browsers",
@@ -30,7 +30,6 @@ const RUNTIME_EXTERNAL = [
 	"turndown-plugin-gfm",
 	"@mozilla/readability",
 	"linkedom",
-	"markit-ai",
 	"@agentclientprotocol/sdk",
 ];