feat(consistency): implement ADR-001 consistency checking engine (CUST-WP-0008)

Adds state-hub/scripts/consistency_check.py with C-01 through C-12 checks:
bidirectional file↔DB validation, --fix for auto-fixable issues, --all for all
repos, --json output, exit codes 0/1/2.

MCP tool: check_repo_consistency(repo_slug, fix=False)
Makefile: check-consistency, fix-consistency, check-consistency-all, fix-consistency-all

Auto-fixes applied across all repos:
- C-09: activity-core-foundation + activity-core-triggers-ops repo_id → activity-core
- C-04: railiance phase-0-operational-baseline status → completed
- C-05: railiance phase-0 title synced from file
- C-10/C-11: task status drifts resolved; state_hub_task_id injected into
  CUST-WP-0006 and CUST-WP-0007 task blocks

Remaining orphans reported for human review: repo-integration-activity-core,
infospace-s3-closeout, testdrive-jsui-publication, staged-promotion-lifecycle,
three-phoenix-ha-cluster, current-env-safety-net.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

mcp_server/server.py

@@ -859,6 +859,84 @@ def validate_repo_adr(repo_path: str, domain_slug: str | None = None) -> str:
     return "\n".join(lines)
 
 
+# ---------------------------------------------------------------------------
+# ADR-001 consistency checking engine
+# ---------------------------------------------------------------------------
+
+@mcp.tool()
+def check_repo_consistency(repo_slug: str, fix: bool = False) -> str:
+    """Run ADR-001 consistency check for a registered repo.
+
+    Performs bidirectional checks between workplan files in the repo and the
+    state-hub DB. The file is always authoritative: drift is reported with the
+    file value as the expected value.
+
+    Checks: missing workplans/, parse errors, stale DB references, status/title
+    drift, unlinked workplans, orphan DB workstreams, repo mismatches, task
+    status drift, unlinked tasks, and orphan DB tasks.
+
+    Args:
+        repo_slug: Registered repo slug (e.g. 'the-custodian', 'activity-core').
+        fix: If True, apply auto-fixable issues: status drift (C-04), title drift
+             (C-05), create missing DB workstreams (C-06), repo mismatch (C-09),
+             task status drift (C-10), create unlinked tasks (C-11).
+    """
+    import subprocess
+    script = Path(__file__).parent.parent / "scripts" / "consistency_check.py"
+    cmd = [sys.executable, str(script), "--repo", repo_slug, "--json",
+           "--api-base", API_BASE]
+    if fix:
+        cmd.append("--fix")
+
+    result = subprocess.run(cmd, capture_output=True, text=True)
+    try:
+        data = json.loads(result.stdout)
+    except json.JSONDecodeError:
+        return f"Consistency check script error:\n{result.stderr or result.stdout or '(no output)'}"
+
+    issues = data.get("issues", [])
+    summary = data.get("summary", {})
+    overall = data.get("result", "unknown")
+    fixes = data.get("fixes_applied", [])
+
+    failures = [i for i in issues if i["severity"] == "FAIL"]
+    warnings = [i for i in issues if i["severity"] == "WARN"]
+    infos = [i for i in issues if i["severity"] == "INFO"]
+
+    lines = [
+        f"Consistency Check: {repo_slug}",
+        f"Path: {data.get('repo_path', '?')}",
+        "",
+    ]
+
+    for sev, group in (("FAIL", failures), ("WARN", warnings), ("INFO", infos)):
+        if not group:
+            continue
+        lines.append(f"{sev}S ({len(group)}):")
+        for i in group:
+            loc = f"  [{i['file_path']}]" if i.get("file_path") else ""
+            fix_tag = " [fixable]" if i.get("fixable") else ""
+            lines.append(f"  {i['check_id']}{loc}{fix_tag}")
+            lines.append(f"    {i['message']}")
+        lines.append("")
+
+    if fixes:
+        lines.append(f"Fixes applied ({len(fixes)}):")
+        for f in fixes:
+            lines.append(f"  {f}")
+        lines.append("")
+
+    lines.append(
+        f"Summary: {summary.get('fail', 0)} fail | "
+        f"{summary.get('warn', 0)} warn | "
+        f"{summary.get('info', 0)} info"
+    )
+    lines.append(
+        f"Result: {'FAIL' if overall == 'fail' else 'PASS (with warnings)' if overall in ('warn',) else 'PASS'}"
+    )
+    return "\n".join(lines)
+
+
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