Merge pull request 'ci+quality: structural gates (CI: 3 new; local: 7 new + .clang-tidy)' (#18) from ci/structural-tests into main

doc/architecture/locked-vs-flexible.md

@@ -262,7 +262,11 @@ mechanical next step rather than a missing piece of theory.
 | **Named-parameter chaining: `\|`-operator only, no `.a().b().c()`.** Member-style chaining would need a patch to CGAL's upstream `parameters_interface.h`, which we treat as a read-only vendored dependency.  The pipe operator is documented, ADL-discoverable, and equivalent in expressive power. | pipe shipped, member-chain deferred until upstream extension point exists | ~2 days (only if upstream PR is accepted) |
 | **Phase 9b-analytic: derivation complete, code uses block-FD.** The Schläfli-based analytic HyperIdeal Hessian is fully derived in [`hyperideal-hessian-derivation.md`](../math/hyperideal-hessian-derivation.md) (805 lines, all sign pitfalls covered).  The shipped code still uses per-face block-FD (already 96× faster than the legacy full-FD path). | research-ready writeup; implementation gated on the reviewer's view of whether the additional ~6× is worth it | ~2 weeks |
 | **Doxygen `WARN_IF_UNDOCUMENTED = NO`.** With `EXTRACT_ALL = YES`, every symbol is in the generated HTML — live at <https://tmoussa.codeberg.page/ConformalLabpp/> (auto-published from `main` by `.gitea/workflows/doxygen-pages.yml`) — but symbols without explicit doc comments show only their signature.  Public API surface (entry functions, named-parameter helpers, traits typedefs) has hand-written Doxygen; internal helpers vary. | clean (0 warnings) under current policy; not yet enforced "no undocumented symbol"; pursued on a separate branch | ~3 days to drive `WARN_IF_UNDOCUMENTED = YES` to zero |
-| **`check-test-counts.sh` not wired into CI.** The script exists, runs locally, and gives the correct answer (23 + 234 = 257 / 0 skipped).  CI does not yet fail on a mismatch. | local guard exists, CI integration pending next workflow touch | ~1 hour |
+| **`check-test-counts.sh` not wired into CI.** ✅ Closed by branch `ci/structural-tests`.  Step is now part of `.gitea/workflows/cpp-tests.yml` (re-uses the just-built `build/` dir; ~5 s overhead). | gate active on every PR | done |
+| **End-to-end smoke (`try_it.sh`) not in CI.** ✅ Closed by `ci/structural-tests`.  Added as a step after the CGAL job. | gate active on every PR | done |
+| **Internal markdown link checker.** ✅ Closed by `ci/structural-tests`.  New `.gitea/workflows/markdown-links.yml` runs on every PR that touches a `*.md` file, plus a weekly cron for external link rot. | gate active on every PR + weekly | done |
+| **Local quality gates (sanitizers, coverage, clang-tidy, multi-compiler, CGAL-version-matrix, reproducible-build, license-headers).** Eight scripts under `scripts/quality/`, driven by `run-all.sh`.  Documented in `scripts/quality/README.md` with promotion-to-CI checklist. | local-only by design; promotion gated on policy text in release-policy.md | done as scripts; 60 SPDX headers missing in `code/include/` will be a follow-up |
+| **Code-style / convention gates (clang-format + CGAL-conventions checker).** ✅ Closed by `ci/structural-tests`. Adds `.clang-format` (project style mechanically captured) + `clang-format.sh` (drift detector, `--fix` mode); `cgal-conventions.py` enforces 6 CGAL-specific idioms (include-guard format, `\file` brief, namespace nesting, named-parameter tag `_t` suffix, no `using namespace`, no stray `#define`).  Both are intentionally local-only — promotion to CI once the existing tree passes `--strict` (today CGAL-conventions does pass: 0/6 violations across 6 CGAL public headers; clang-format drift TBD pending toolchain install). | done as scripts; promotion deferred | done |
 | **CP-Euclidean and Inversive-Distance research-track entries.** Both ship a working DCE solver, but lack the auxiliary utilities the Euclidean / HyperIdeal entries have (curvature inspection helpers, edge-flip Delaunay maintenance for ID).  Out of port scope; listed in [`research-track.md`](../roadmap/research-track.md). | research-track, not blocking | per-utility |
 | **`StereographicUnwrapper`, `CircleDomainUnwrapper`, `CuttingUtility`, `KoebePolyhedron`.** Mentioned in roadmap + research-track docs but not yet ported.  Java versions still authoritative. | documented as Phase 11+ / optional | weeks each — explicit "out of port scope unless requested" |