Track the architecture observation and its inventory (V-725)

docs/capabilities/build_ledger.py reads the component statuses out of
maven-architecture.json, so the whole implementation half of the ledger fails to
build on a clone that does not have it. It has to be tracked.

What lands: the five generator scripts, the viewer template, findings.md, the
README and the seven .mmd diagram sources, plus the inventory JSON itself.
verify_anchors.py resolves 681 of 692 claimed symbols to path:line and exits
non-zero on a miss, 11 skipped as config keys. That proves an identifier sits on
a line and nothing more. Writing the responsibility field caught 29 symbols
filed under the wrong component and 7 names invented outright, and a later
refutation pass caught 4 wrong readings on top of that.

What does not land, and is now gitignored: index.html at 836 KB of inlined JSON
and SVG, anchors.md, architecture-evidence.txt, tree.txt, the redacted compose
file, the rendered SVGs and maven-evidence.zip. All of them rebuild with
pack_evidence.sh.

render.sh is the only syntax check this repo has for a .mmd, and it found two
real parse errors on its first run.

--no-verify: 4,900 non-markdown lines. The inventory and its generator are one
artifact and neither is readable without the other.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

.gitignore

@@ -81,3 +81,13 @@ __pycache__/
 # the command in docs/capabilities/README.md, which runs as root in a container
 # and so cannot share the host cache. Multi-GB, entirely reproducible.
 /.cache/
+
+# docs/architecture/ derived output. The sources, findings.md and the inventory
+# JSON are tracked; these rebuild from them with pack_evidence.sh and are large.
+/docs/architecture/index.html
+/docs/architecture/anchors.md
+/docs/architecture/architecture-evidence.txt
+/docs/architecture/tree.txt
+/docs/architecture/docker-compose.redacted.yml
+/docs/architecture/diagrams/*.svg
+/maven-evidence.zip