One binary: the lint and the trainer are commands of portal

portal serve runs a site; portal lint is what iris was; portal plan,
build, report and the rest are what portal-trainer was. One source at
one version, so the three never disagree about what content means.
Both histories are merged in (subtree). The release attaches the bare
binary for a content repo's CI. The trainer's plans, intakes, engines
and reference prompt come along; its runs stay in the old repo.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GT37Z1Xtfd9pUuQtMTg6Yt

docs/SUMMARY.md

@@ -12,6 +12,11 @@
 - [Memberships](memberships.md)
 - [Operations](operations.md)
 
+# The trainer and the lint
+
+- [Training a site](training.md)
+- [The lint](lint.md)
+
 # How it is made
 
 - [Architecture](architecture.md)
@@ -20,3 +25,4 @@
 ---
 
 [Changelog](changelog.md)
+[The lint's changelog, to 0.5.11](lint-changelog.md)