Create an optional hook system for externally-managed verification

.claude/commands/formspec.verify.3.md

@@ -19,6 +19,10 @@ If either is missing, tell the user to run `/formspec.formalize.2` first and sto
 
 ### 2. Run TLC
 
+If `spec/hooks/run-checks` exists and is executable, delegate verification to it instead of running TLC locally (see `/formspec.init` for the hook interface). Build the request from `spec/formal/traceability.md` (properties and their types) and `spec/formal/System.cfg` (the TLC invocation hint). Present the returned results to the developer, including any dashboard URLs.
+
+If the hook does not exist or fails, run TLC locally:
+
 ```bash
 tlc spec/formal/System.tla -config spec/formal/System.cfg -workers auto -metadir /tmp/tlc-states -cleanup
 ```
@@ -27,12 +31,13 @@ Run from the project root directory. The `-metadir` flag directs TLC's working s
 
 ### 3. Parse and report
 
-Read the TLC output and produce a structured report:
+Read the TLC output (or hook response) and produce a structured report:
 
 **Summary**:
 - States explored / distinct states
 - Duration
 - Overall result: PASS or FAIL
+- Dashboard URL (if provided by hook)
 
 **Property results** (table format):