Summary

Adds scripts/hcg-spec-coverage-check.sh: a static, source-only audit that asserts every HTTP route declared in docs/specification/openapi.yaml is covered by at least one rule in the HCG live Verb Governance Spec (config/gateway-policy-boj.yaml).

Companion / complement to PR #228's hcg-surface-drift-check.sh. The two scripts bracket the contract §8 declared-surface invariant from both directions:

Contract §8 (docs/integration/http-capability-gateway-boj-contract.md) is explicit: "the Verb Governance Spec governs the declared surface (openapi.yaml), not only the currently-wired subset. Declared-but-unimplemented routes are still classified in the policy so that when the gnosis handler grows them they are governed from day one rather than silently exposed." The live policy header carries the cross-check statement ("Surface source: docs/specification/openapi.yaml, cross-checked against elixir/lib/boj_rest/router.ex"); PR #228 made the router half machine-checkable, this PR makes the openapi half machine-checkable. Together they make the entire §1.5 re-verification stamp executable.

Without this check the risk is concrete: someone adds a new path to openapi.yaml without a corresponding policy rule. The surface-drift check does not catch it (the route is not yet wired in router.ex). The day the route is wired, the surface-drift gate fires — but by then the operator has to either (a) ship the wiring with a default-deny in production for a route that should be live or (b) hold the wiring PR until the policy catches up. Catching the gap at spec-edit time avoids both, with no procedural cost above running the existing CI gate.

What the script does

1. Extracts (verb, path-template) tuples from the paths: section of docs/specification/openapi.yaml — path entries at exactly 2-space indent, HTTP operations (get/post/put/delete/patch/head/options) at exactly 4-space indent under each path. Other keys at 4-space indent (parameters/summary/description/tags/...) are metadata, not operations, and are skipped.
2. Extracts (verb, path-pattern) tuples from config/gateway-policy-boj.yaml using the identical extraction block that hcg-surface-drift-check.sh uses, so the two scripts cannot drift in how they read the policy.
3. For each declared route, concretises {name}-style placeholders with a known probe segment (probe, shared with the smoke + surface-drift scripts so a future regex tightening fails all three in lock-step) and asserts at least one policy rule covers it: literal equality for non-regex paths; ERE grep -E match against the concrete URL for ^… regex paths. The declared verb must be in the policy rule's verb list.
4. Exit 0 on no gap, 1 on gap detected, 64 on bad usage.

What this PR does NOT do

• Does not modify the rollout runbook §1.5 or the contract §8. Adoption as the §1.5 declared-surface check is a separate, owner-driven PR; this PR lands the artefact only so the runbook update is a one-line wiring change. Matches the §228-then-runbook split.
• Does not wire the script into CI. Boj-server's CI discipline (docs/wikis/CI-and-Required-Checks.adoc / .claude/CLAUDE.md) requires path-filtered required checks to use the "always-trigger + changes job" pattern; a CI wiring PR should follow that pattern, matching the feat(hcg): add surface-drift check script (standards#100 §1.5) #228 → ci(hcg): wire surface-drift check into Actions (standards#100 §1.5) #229 split. Out of scope here.
• Does not modify the openapi.yaml or the policy. On this branch the script reports OK against today's surface — every one of the 26 (verb, path) pairs declared in openapi.yaml has a matching rule among the 28 (verb, path) rules in the live policy. The 2-rule surplus is the policy's coverage of routes the openapi.yaml does not declare (notably /.well-known/boj-node-pubkey, which the router wires but the spec does not yet enumerate); the script intentionally does not penalise that direction — see the script's Limitations header.
• Does not pre-empt the §6.4 Trustfile flip (tier_2_gateway.status stays PENDING).
• Per single-lane HCG channel discipline (pattern set in http-capability-gateway PRs feat: add MCP stdio transport bridge #10, fix: make MCP bridge inspectable by Glama #11, fix: root package.json for Glama tool detection #12, fix: offline inspection mode for Glama tool detection #14, Update dependabot.yml #22, Add Green Web Foundation badge #26, Claude/resume repos migration 9 o2 u1 #30, chore(deps): bump nixpkgs from 01fbdee to 6368eda #38 and boj-server PRs Phase A — http-capability-gateway↔BoJ contract + policy authoring workflow + example spec #78, Phase C: declare gateway↔BoJ-gnosis seam in Trustfile [SEAMS] #90, fix(trust): enforce §3 invariant 3 — BoJ ignores X-Trust-Level from non-loopback (standards#98) #106, docs(hcg-load-profile): Phase D D1 — load profile declaration (standards#99) #168, feat(k8s): NetworkPolicy restricting BoJ ingress to HCG pod (#135) #173, docs(hcg-runbook): refresh rollout runbook v0.1→v0.2 after Phase D close (standards#100) #207, feat(config): promote gateway policy example → live (Phase E §1.5) #208, feat(scripts): hcg-policy-smoke.sh — §1.5 operator pre-check (Phase E) #210, feat(scripts): extend §1.5 verb-canary coverage (Phase E) #215, feat(scripts): hcg-policy-smoke.sh — unknown-path default-deny canary (Phase E) #222, feat(scripts): hcg-policy-smoke.sh — stealth-profile status canary (Phase E) #224, docs(integration): Phase E observability spec (standards#100) #226, feat(hcg): add surface-drift check script (standards#100 §1.5) #228, ci(hcg): wire surface-drift check into Actions (standards#100 §1.5) #229): joint-close is owner-only. This PR refs but does not close standards#100.

Channel state note

This session could not read hyperpolymath/standards#91 / #100 (the session's repository scope is restricted to http-capability-gateway and boj-server), so the brief's instructed status comment on standards#91 could not be posted. State was reconstructed from the canonical sources in this repo (ADR-0004, the integration plan, the audit, the rollout runbook, the live policy, the openapi spec, and the merged-PR commit history) plus the current main of both in-scope repos. The analysis: Phase A/B/C/D are closed (artefacts merged, runbook §1.2 and the Phase-D status note in the runbook header confirm); Phase E (standards#100) is the only open phase; all remaining §1 checklist items are owner-driven (!OWNER: placeholders, D-4 rebaseline workflow_dispatch, cerro-torre .ctp signing, the §6.4 Trustfile flip). This PR advances Phase E §1.5 ("Gateway-side prerequisites") by converting one half of the declared-surface invariant into an executable artefact, mirroring exactly the script-first split of #228.

Test plan

• Run the script on this branch's working tree: bash scripts/hcg-spec-coverage-check.sh — expect exit 0, "OK: every openapi-declared route is covered by at least one policy rule." with Declared (openapi) routes: 26 and Policy (verb,path) rules: 28.
• Run bash scripts/hcg-spec-coverage-check.sh -v — expect the same exit 0 plus a Matched: block listing each of the 26 declared routes against its policy rule (literal /health → literal rule; /cartridge/{name}/invoke → ^/cartridge/[A-Za-z0-9_.-]+/invoke$ regex; /grpc/{service}/{method} → two-segment regex; /umoja/peers matches both GET and POST rules; etc.).
• Synthetic gap test: build a temporary openapi.yaml containing a single declared path with no policy rule and run OPENAPI_FILE=... bash scripts/hcg-spec-coverage-check.sh — expect exit 1 with the route listed under GAP:. (Verified locally on this branch.)
• Confirm shellcheck scripts/hcg-spec-coverage-check.sh produces only the same SC1001 info note that scripts/hcg-surface-drift-check.sh produces today (the \^ escape inside a case pattern is intentional and matches the sibling script's posture exactly).
• Confirm SPDX header + Owner copyright match the canonical estate format (matches scripts/hcg-surface-drift-check.sh's header shape).
• Verify scripts/check-shebang-first.sh is still green with the new file present.
• Verify no Hypatia / governance / spdx gates fire on the new script file.

Refs hyperpolymath/standards#91
Refs hyperpolymath/standards#100

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