Release 0.14.0: public /docs user guide (DOCS.md served at /docs)

Ships DOCS.md and the /docs route — a plain-prose translation of
SPEC.md for users, distinct from the binding spec. Originating need
was the admin-vs-owner role distinction on /admin/users (§6.1);
response is a single guide that covers the framework's user-facing
surfaces end-to-end (roles, proposing, branches, PRs, graduation,
notifications). Mirrors /philosophy: markdown file at repo root +
sibling backend loader + MarkdownPreview render. No schema migration.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

backend/app/api.py

@@ -26,6 +26,7 @@ from . import (
     api_prs,
     auth,
     db,
+    docs as docs_mod,
     entry as entry_mod,
     cache,
     funder,
@@ -122,6 +123,17 @@ def make_router(
         payload = philosophy.load()
         return {"body": payload["body"]}
 
+    # ---------------------------------------------------------------
+    # /api/docs — DOCS.md served verbatim. Sibling of /api/philosophy:
+    # no auth gate, same disk-first load + cache shape, same intent —
+    # public read surface for a markdown file checked into the repo.
+    # ---------------------------------------------------------------
+
+    @router.get("/api/docs")
+    async def get_docs() -> dict[str, Any]:
+        payload = docs_mod.load()
+        return {"body": payload["body"]}
+
     # ---------------------------------------------------------------
     # Auth surface — reads role from our users table per §6.
     # ---------------------------------------------------------------