v0.316.0 CHANGELOG; the push-once fact in this repo's unprompted-work rule

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0117kRTSgs3rJWUFGxyoWN6Y

.claude/rules/unprompted-work.md

@@ -50,6 +50,12 @@ it **first** in the morning note. A decision you cannot write in that shape is o
    on Tester 1, demo-hp and demo-felhom through the normal update path and the box walk's checks are green
    on all three — not at night unless the night brief says so. **Agent releases still stop for the
    operator's vouch.** The golden is baked weekly and vouched by the operator; CC never vouches. **No `--no-verify`.**
+   **A version number is pushed once** — `felhom-controller/controller/build.sh` now refuses a second
+   push of a tag that exists, and a registry it cannot reach is a refusal too. This is a FACT about
+   what the build does, not a new rule: a fix for something already pushed is the next patch version,
+   and a box on a bad image is moved by the normal update path, never by re-tagging. Earned on
+   2026-10-15, when 0.315.0 was pushed three times from three different commits and a cache kept
+   serving the first one (`09-update-architecture.md` §0).
 7. **An enumerated gap becomes a row in the same session — or, if it is small, is fixed in it** (the size rule).
    Prose is not a record.
 8. **Hungarian text is searched with ASCII fragments**, with a positive and a negative control.