test: cover new Badges/Topology MUST-Sections (S2 iter)

User-feedback iteration on S2 PoC template:
- Update validate_readme_structure test-data ('complete' + 'missing_api')
  to use new bold-list Badges + ## Topology H2 heading.
- Add 'missing_topology' case: README without ## Topology heading must
  report Topology as missing MUST-Section.
- Add 'missing_badges' case: README without **Lib-ID:** bold-line must
  report Badges as missing MUST-Section.

Assertion-count: 32 -> 35 (+3 new). README Coverage-Statement updated.

README.md

@@ -13,8 +13,8 @@ Per Fault-Injection-Audit-Convention (2026-05-16):
 | `diff_surface` | 5 | Equal (no diff), surface-superset (missing), doc-superset (stale) |
 | `grep_engine_calls` | 5 | 3 unique calls, no-calls edge |
 | `generate_topology_block` | 6 | Lib-with-deps+engine, asset-lib (no deps, no engine) |
-| `validate_readme_structure` | 5 | Complete core, missing-API core, community-tier-no-enforcement |
+| `validate_readme_structure` | 8 | Complete core, missing-API core, missing-Topology, missing-Badges, community-tier-no-enforcement |
-| **TOTAL** | **32** | |
+| **TOTAL** | **35** | |
 
 ### Tested-Surface
 - All 6 public functions of `lib-core.api-discovery` v0.1.0.

init.lua

@@ -132,9 +132,12 @@ end
         local complete = [[
 # lib-core.foo
 Abstract.
-| Field | Value |
+
-|---|---|
+**Version:** 0.1.0
-| Version | 0.1.0 |
+**Lib-ID:** lib-core.foo
+**Requires:** (none)
+
+## Topology
 
 <!-- topology:start -->
 <!-- topology:end -->
@@ -154,7 +157,11 @@ Sig.
         local missing_api = [[
 # lib-core.foo
 Abstract.
-| F | V |
+
+**Version:** 0.1.0
+**Lib-ID:** lib-core.foo
+
+## Topology
 
 <!-- topology:start -->
 <!-- topology:end -->
@@ -170,6 +177,58 @@ Abstract.
         end
         engine.test.assert(has_api_missing, "validate: missing-sections list contains 'API'")
 
+        -- Missing Topology heading: should detect Topology as missing MUST-section
+        local missing_topology = [[
+# lib-core.foo
+Abstract.
+
+**Version:** 0.1.0
+**Lib-ID:** lib-core.foo
+
+<!-- topology:start -->
+<!-- topology:end -->
+
+## API
+
+### `foo.bar()`
+Sig.
+
+## References
+- spec
+]]
+        local r_topo = api.validate_readme_structure(missing_topology, "core")
+        engine.test.assert(#r_topo.missing_sections > 0, "validate: missing Topology heading -> reports missing")
+        local has_topology_missing = false
+        for _, s in ipairs(r_topo.missing_sections) do
+            if s == "Topology" then has_topology_missing = true end
+        end
+        engine.test.assert(has_topology_missing, "validate: missing-sections list contains 'Topology'")
+
+        -- Missing Badges (no **Lib-ID:** bold line): should detect Badges as missing
+        local missing_badges = [[
+# lib-core.foo
+Abstract.
+
+## Topology
+
+<!-- topology:start -->
+<!-- topology:end -->
+
+## API
+
+### `foo.bar()`
+Sig.
+
+## References
+- spec
+]]
+        local r_badges = api.validate_readme_structure(missing_badges, "core")
+        local has_badges_missing = false
+        for _, s in ipairs(r_badges.missing_sections) do
+            if s == "Badges" then has_badges_missing = true end
+        end
+        engine.test.assert(has_badges_missing, "validate: missing-sections list contains 'Badges'")
+
         -- Tier community: lockerer
         local r3 = api.validate_readme_structure(missing_api, "community")
         engine.test.equals(#r3.missing_sections, 0, "validate: tier=community -> no enforcement")