diff --git a/.gitea/workflows/cpp-tests.yml b/.gitea/workflows/cpp-tests.yml
index f286a4a..6204fb4 100644
--- a/.gitea/workflows/cpp-tests.yml
+++ b/.gitea/workflows/cpp-tests.yml
@@ -152,25 +152,25 @@ jobs:
 # ─────────────────────────────────────────────────────────────────────────────
 # Job 3 — quality-gates  (style + convention block)
 #
-# Cheap, deterministic checks that should never break unless a contributor
-# introduces a regression.  Each gate is a script under scripts/quality/
-# and exits 0 only when its tree is clean.  These ran for weeks locally
-# at zero findings before being promoted here.
+# Trigger: write "/quality-gates" as a comment on any pull request.
 #
-# Tools installed at job-start (the ci-cpp image already has python3 +
-# bash; we add codespell + shellcheck on top).  Total wall-time: ~30 s
-# on the eulernest runner.
-#
-# Strictly required for merges into main/dev — a regression fails the PR.
+# Cheap, deterministic checks (~30 s): license headers, CGAL conventions,
+# codespell, shellcheck.  Runs independently of test-fast when comment-
+# triggered (no `needs:` — the caller decides when to invoke it).
 # ─────────────────────────────────────────────────────────────────────────────
   quality-gates:
-    needs: test-fast
+    if: |
+      github.event_name == 'issue_comment' &&
+      github.event.issue.pull_request != null &&
+      contains(github.event.comment.body, '/quality-gates')
     runs-on: eulernest
     container:
       image: git.eulernest.eu/conformallab/ci-cpp:latest
 
     steps:
       - uses: actions/checkout@v4
+        with:
+          ref: refs/pull/${{ github.event.issue.number }}/head
 
       - name: Install codespell + shellcheck (job-local)
         run: |
diff --git a/.gitea/workflows/doc-build.yaml b/.gitea/workflows/doc-build.yaml
index dc4216b..ec00023 100644
--- a/.gitea/workflows/doc-build.yaml
+++ b/.gitea/workflows/doc-build.yaml
@@ -1,34 +1,38 @@
 name: API Docs
 
+# Trigger: write "/docs" as a comment on any pull request.
+# Also available via workflow_dispatch for manual runs outside a PR context.
+
 on:
-  push:
-    branches:
-      - main
-  pull_request:
+  issue_comment:
+    types: [created]
+  workflow_dispatch: {}
 
 # ─────────────────────────────────────────────────────────────────────────────
 # Doc-build — informational only
 #
 # Generates Doxygen HTML from the public headers and reports warning
 # statistics.  Does NOT block merges: `continue-on-error: true` ensures
-# warnings or extraction issues never fail the CI gate.  When Doxygen
-# coverage is denser (Phase 8c), this job can be promoted to a hard
-# requirement and the HTML deployed to Pages.
+# warnings or extraction issues never fail.
 #
-# Note: Gitea Actions on GHES does not support `actions/upload-artifact@v4`,
-# so HTML artifact upload is intentionally omitted.  The warning summary
-# in the job log is the primary reviewer signal; reviewers who want the
-# HTML can rebuild it locally with `cmake --build build --target doc`.
+# Trigger: "/docs" PR comment (or workflow_dispatch for manual runs).
+# Checkout uses refs/pull/N/head when triggered via comment.
 # ─────────────────────────────────────────────────────────────────────────────
 jobs:
   doc-build:
-    if: github.event_name == 'pull_request'
+    if: |
+      github.event_name == 'workflow_dispatch' ||
+      (github.event_name == 'issue_comment' &&
+       github.event.issue.pull_request != null &&
+       contains(github.event.comment.body, '/docs'))
     runs-on: eulernest
     container:
       image: git.eulernest.eu/conformallab/ci-cpp:latest
     continue-on-error: true   # never block the merge
     steps:
       - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event_name == 'issue_comment' && format('refs/pull/{0}/head', github.event.issue.number) || github.ref }}
 
       - name: Generate API documentation
         run: doxygen Doxyfile 2>&1 | tee doxygen.log
diff --git a/.gitea/workflows/markdown-links.yml b/.gitea/workflows/markdown-links.yml
index b7affac..96f7776 100644
--- a/.gitea/workflows/markdown-links.yml
+++ b/.gitea/workflows/markdown-links.yml
@@ -1,35 +1,36 @@
 name: Markdown link check
 
 # Verify every internal markdown link in the repo resolves to an existing
-# file (or anchor).  External http(s) links are also probed but with a
-# loose timeout — flaky third-party hosts must not break our CI.
+# file (or anchor).
 #
-# Trigger: PRs that touch any *.md file, plus a weekly cron so external
-# link rot is caught even when nobody is editing docs.
+# Triggers:
+#   - "/links" as a PR comment  (manual, on the PR branch)
+#   - Weekly cron Mon 05:00 UTC (catches link rot without any PR activity)
+#   - workflow_dispatch          (manual run on any branch)
 
 on:
-  pull_request:
-    paths:
-      - "**/*.md"
-      - ".gitea/workflows/markdown-links.yml"
-  push:
-    branches:
-      - main
-    paths:
-      - "**/*.md"
-      - ".gitea/workflows/markdown-links.yml"
+  issue_comment:
+    types: [created]
   schedule:
     - cron: "0 5 * * 1"   # Monday 05:00 UTC weekly link-rot check
   workflow_dispatch: {}
 
 jobs:
   check:
+    if: |
+      github.event_name == 'schedule' ||
+      github.event_name == 'workflow_dispatch' ||
+      (github.event_name == 'issue_comment' &&
+       github.event.issue.pull_request != null &&
+       contains(github.event.comment.body, '/links'))
     runs-on: eulernest
     container:
       image: git.eulernest.eu/conformallab/ci-cpp:latest
 
     steps:
       - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event_name == 'issue_comment' && format('refs/pull/{0}/head', github.event.issue.number) || github.ref }}
 
       # ── Pure-python internal link check (no external network needed) ────
       # We use the same logic that found the 2 broken links before the
diff --git a/CLAUDE.md b/CLAUDE.md
index 0b3f9dc..085418f 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -264,9 +264,11 @@ Three jobs in `.gitea/workflows/cpp-tests.yml`:
 
 | Job | CMake flags | Deps | Triggers on | Status |
 |---|---|---|---|---|
-| `test-fast` | *(none)* | Eigen + GTest only | all branches | **active** |
-| `test-cgal` | `-DWITH_CGAL_TESTS=ON -DCONFORMALLAB_LOW_MEMORY_BUILD=ON` | + Boost | `/test-cgal` PR comment | **active** (comment-triggered, 2026-05-31) |
-| `quality-gates` | *(none)* | + codespell, shellcheck | all branches (`needs: test-fast`) | **active** |
+| `test-fast` | *(none)* | Eigen + GTest only | all branches (auto) | **active** |
+| `test-cgal` | `-DWITH_CGAL_TESTS=ON -DCONFORMALLAB_LOW_MEMORY_BUILD=ON` | + Boost | `/test-cgal` PR comment | **active** |
+| `quality-gates` | *(none)* | + codespell, shellcheck | `/quality-gates` PR comment | **active** |
+| `doc-build` | *(none)* | Doxygen | `/docs` PR comment or `workflow_dispatch` | **active** |
+| `markdown-links` | *(none)* | python3 | `/links` PR comment, weekly cron, `workflow_dispatch` | **active** |
 
 Runner: `eulernest` — self-hosted Raspberry Pi, ARM64, Ubuntu 22.04. Docker image: `git.eulernest.eu/conformallab/ci-cpp:latest`. `test-cgal` and `quality-gates` both need `test-fast` to pass first (`needs: test-fast`).