fix: control-plane guide org/repo params and local repo alignment (#588)

#530's remote/repo guard blocked mcp_get_control_plane_guide(remote=prgs)
because the bare default resolves to Timesheet while local git is
Gitea-Tools, and remediation told callers to pass org/repo on a tool that
did not accept those parameters.

- Accept optional org/repo on mcp_get_control_plane_guide
- Prefer local git remote org/repo when bare defaults mismatch (read-only guide)
- Keep mutation tools fail-closed on bare mismatch
- Align remediation text with tools that accept org/repo

Closes #588

remote_repo_guard.py

@@ -16,11 +16,35 @@ or the local remote URL is unavailable (best-effort corroboration only).
 
 from __future__ import annotations
 
+import re
+
 REMEDIATION = (
-    "Pass explicit org= and repo= matching the local git remote, "
-    "e.g. org=Scaled-Tech-Consulting repo=Gitea-Tools."
+    "Pass explicit org= and repo= matching the local git remote on tools that "
+    "accept those parameters (including mcp_get_control_plane_guide), "
+    "e.g. org=Scaled-Tech-Consulting repo=Gitea-Tools. "
+    "Do not pass org/repo to tools whose schema does not list them."
 )
 
+# https://host/org/repo.git  or  git@host:org/repo.git
+_REMOTE_URL_SLUG_RE = re.compile(
+    r"(?:[:/])(?P<org>[^/]+)/(?P<repo>[^/]+?)(?:\.git)?/*$"
+)
+
+
+def parse_org_repo_from_remote_url(remote_url: str | None) -> tuple[str, str] | None:
+    """Best-effort parse of org/repo from a git remote URL."""
+    url = (remote_url or "").strip()
+    if not url:
+        return None
+    match = _REMOTE_URL_SLUG_RE.search(url)
+    if not match:
+        return None
+    org = (match.group("org") or "").strip()
+    repo = (match.group("repo") or "").strip()
+    if not org or not repo:
+        return None
+    return org, repo
+
 
 def assess_remote_repo_match(
     *,