Enable CI gate: fix Doxygen and add workflow.

Clear doc-block warnings so doxygen exits 0, add GitHub Actions
for host tests, Doxygen, and manual sync, and document CI in the manual.

Co-authored-by: Cursor <cursoragent@cursor.com>

Software/docs/TODO.md

@@ -12,9 +12,8 @@ errors, no plaintext secrets.
 
 Working directory for all commands is `Software/`.
 
-**Current firmware:** `0.7.0` — BT1035 pairing (`/api/bluetooth/*`),
-station presets (`/api/stations/*`), host tests green (10/10), manual
-sync green (38 classes).
+**Current firmware:** `0.7.1` — CI green gate (Doxygen + host tests +
+manual sync), BT1035 pairing, station presets.
 
 ---
 
@@ -30,28 +29,14 @@ sync green (38 classes).
 
 ## P0 — Fix the build gate (do this first)
 
-### T1. Clear the 16 Doxygen warnings
-**Why:** `doxygen Doxyfile` currently exits non-zero, so the docs gate is
-red and CI (once added) will fail.
-**What:**
-- Replace the invalid `\texttt{...}` with `` `...` `` (backticks) or
-  `\c word` in: `core/AudioProfileJson.hpp` (l.58, l.80),
-  `core/AudioEnhancements.hpp` (l.25).
-- Fix `\r` interpreted as a command in `core/Bt1035At.hpp` (l.64) —
-  wrap the AT string in `@code ... @endcode` or escape as `\\r`.
-- Add a space after `\ref` in `bt1035/Bt1035Driver.hpp` (l.89) and
-  `core/AudioEnhancements.hpp` (l.24).
-- Document the missing `@param companionChips` in
-  `net/NetBootstrap.hpp` (`start`) and `net/SetupWebServer.hpp` (`start`).
-**Done when:** `doxygen Doxyfile` exits 0 and `docs/api/doxygen-warnings.log`
-is empty.
+### T1. Clear the 16 Doxygen warnings — **DONE (fw 0.7.1)**
+Fixed invalid `\texttt`/`\r`/`\ref` in doc blocks; documented
+`Station` accessors and `NetBootstrap`/`SetupWebServer` parameters.
+`doxygen Doxyfile` exits 0 with an empty warnings log.
 
-### T2. Add the CI workflow
-**Why:** validate every push automatically.
-**What:** add `.github/workflows/ci.yml` with three jobs — host build +
-`ctest`, `doxygen` (fail on warnings), and `check-manual-sync.py`. A ready
-draft was prepared; place it and confirm all three jobs pass.
-**Done when:** the workflow is green on `main` after T1.
+### T2. Add the CI workflow — **DONE (fw 0.7.1)**
+`.github/workflows/ci.yml`: host `ctest`, Doxygen, manual sync on every
+push/PR to `main`.
 
 ---
 

Software/docs/manual/ch-build.tex

@@ -62,6 +62,20 @@ doxygen Doxyfile
 python3 tools/check-manual-sync.py
 \end{drcode}
 
+\section{Continuous integration}
+
+Every push and pull request to \texttt{main} runs
+\texttt{.github/workflows/ci.yml} at the repository root (three parallel
+jobs, all from the \texttt{Software/} directory):
+
+\begin{enumerate}
+  \item \textbf{Host tests} --- \texttt{cmake} + \texttt{ctest} on
+        \texttt{components/core/test} (C++23, \texttt{g++-14} on Ubuntu).
+  \item \textbf{Doxygen} --- must exit 0 with an empty
+        \texttt{docs/api/doxygen-warnings.log}.
+  \item \textbf{Manual sync} --- \texttt{tools/check-manual-sync.py}.
+\end{enumerate}
+
 To rebuild the PDF manual (requires a LaTeX installation):
 
 \begin{drcode}[Manual PDF]