Move the code and terraform audits into the reviews plugin

Copy the standalone code-review and terraform-review skills into
plugins/reviews as audit-code and audit-terraform. The rename separates the
automated, linter-driven audits from the guided review-pr walkthrough that
already lived here.

Resolve bundled script paths through ${SKILL_DIR}, exported in a new step 0.
CLAUDE_PLUGIN_ROOT is not set in the Bash tool environment, so the obvious
substitution would have expanded to nothing and broken every collection
script invocation.

Replace the PLAN and DESIGN docs with READMEs written from the current
SKILL.md and scripts. The old docs had drifted badly: they named semgrep
where the code calls opengrep, scoped five review agents where there are
now eight, and predated Lua, PowerShell, and GitHub Actions support.

Add CONSISTENCY_NORMS to the audit-terraform agent inputs. The collection
script writes consistency_norms.json and the agent prompt declares it, but
SKILL.md never listed it, leaving the variable unsubstituted.

Drop the --ingest-verdicts instruction from both skills. review_stats.py
parses no arguments, so the ref-mode verdict template it told users to feed
back could never be read.

Point audit-terraform's smoke test at README.md and resolve its fixture
paths relative to the test file rather than an absolute home directory.

Tests: 197 passing (audit-code), 106 passing (audit-terraform).

plugins/reviews/skills/audit-terraform/scripts/catalog.py

@@ -0,0 +1,132 @@
+"""Reconcile plan-detected and diff-detected resources into a catalog.
+
+Schema: one entry per (source_dir, local_address). Each entry carries a list
+of CatalogInstance (plan_dir, address_at_plan, action) so a module reviewed
+at N callsites yields one entry, not N.
+"""
+from __future__ import annotations
+
+from dataclasses import dataclass
+
+from scripts.manifest import CatalogEntry, CatalogInstance, ModuleGraphEntry
+
+
+@dataclass(frozen=True)
+class PlanHit:
+    address: str
+    type: str
+    action: str
+
+
+@dataclass(frozen=True)
+class DiffHit:
+    source_dir: str
+    local_address: str
+    type: str
+
+
+def _strip_module_prefix(address: str) -> tuple[list[str], str]:
+    parts = address.split(".")
+    locals_: list[str] = []
+    while len(parts) >= 2 and parts[0] == "module":
+        locals_.append(parts[1])
+        parts = parts[2:]
+    return locals_, ".".join(parts)
+
+
+def _plan_source_dir(plan_dir: str, address: str,
+                     module_graph: dict[str, ModuleGraphEntry]) -> str:
+    module_locals, _ = _strip_module_prefix(address)
+    if not module_locals:
+        return plan_dir
+    current_dir = plan_dir
+    for module_local in module_locals:
+        next_dir = None
+        has_explicit_mapping = False
+        for entry in module_graph.values():
+            local_names = entry.callsite_local_names.get(current_dir)
+            if local_names is None:
+                continue
+            has_explicit_mapping = True
+            if module_local in local_names:
+                next_dir = local_names[module_local]
+                break
+        if next_dir is None:
+            if has_explicit_mapping:
+                return current_dir
+            unique_candidates = sorted(
+                mod_dir for mod_dir, entry in module_graph.items()
+                if current_dir in entry.callsites
+            )
+            if len(unique_candidates) != 1:
+                return current_dir
+            next_dir = unique_candidates[0]
+        current_dir = next_dir
+    return current_dir
+
+
+def build_catalog(
+    plan_hits: dict[str, list[PlanHit]],
+    diff_hits: list[DiffHit],
+    module_graph: dict[str, ModuleGraphEntry],
+) -> list[CatalogEntry]:
+    by_key: dict[tuple[str, str], CatalogEntry] = {}
+
+    def _get(source_dir: str, local_addr: str, type_: str) -> CatalogEntry:
+        k = (source_dir, local_addr)
+        if k not in by_key:
+            by_key[k] = CatalogEntry(
+                source_dir=source_dir,
+                local_address=local_addr,
+                type=type_,
+                source="plan",
+                instances=[],
+            )
+        return by_key[k]
+
+    for plan_dir, hits in plan_hits.items():
+        for h in hits:
+            source_dir = _plan_source_dir(plan_dir, h.address, module_graph)
+            _, local_addr = _strip_module_prefix(h.address)
+            entry = _get(source_dir, local_addr, h.type)
+            entry.instances.append(CatalogInstance(
+                plan_dir=plan_dir, address_at_plan=h.address, action=h.action,
+            ))
+
+    for d in diff_hits:
+        k = (d.source_dir, d.local_address)
+        if k in by_key:
+            existing = by_key[k]
+            by_key[k] = CatalogEntry(
+                source_dir=existing.source_dir,
+                local_address=existing.local_address,
+                type=existing.type,
+                source="both",
+                instances=list(existing.instances),
+            )
+            continue
+        graph_entry = module_graph.get(d.source_dir)
+        if graph_entry and graph_entry.callsites:
+            instances = [
+                CatalogInstance(
+                    plan_dir=cs,
+                    address_at_plan=f"module.<{d.source_dir}>.{d.local_address}",
+                    action="unknown",
+                )
+                for cs in graph_entry.callsites
+            ]
+        else:
+            instances = [CatalogInstance(
+                plan_dir=d.source_dir,
+                address_at_plan=d.local_address,
+                action="unknown",
+            )]
+        by_key[k] = CatalogEntry(
+            source_dir=d.source_dir,
+            local_address=d.local_address,
+            type=d.type,
+            source="diff",
+            instances=instances,
+        )
+
+    return sorted(by_key.values(), key=lambda e: (e.source_dir, e.local_address))