docs(claude): add measurement/step-back/restart/widget rules, correct Gitea-tracking note (v3.6)

CLAUDE.md

@@ -1,6 +1,11 @@
 # CLAUDE.md — Rules for Claude on the Argonaut 3 Project
-**Version:** 3.5
-**Updated:** 8 July 2026
+**Version:** 3.6
+**Updated:** 11 July 2026
+
+**Changelog 3.6:** Added measurement-before-diagnosis, step-back-on-break,
+one-restart-then-verify-9001, and Cockpit widget re-import rules to Working Style.
+Corrected the Documentation discipline note that incorrectly claimed CLAUDE.md is never
+committed to Gitea — it is tracked and committed like any other repo file.
 
 **Changelog 3.5:** Added `[VSC]` terminal label. Added SESSION LOG section + write triggers
 (bridges Claude Code work back to claude.ai chat, which has no native access to Claude Code
@@ -40,6 +45,32 @@ If uncertain: **search first, then act**. Never guess.
 ### One command at a time
 Give one command, wait for feedback, then give the next. Never batch commands unless asked.
 
+### Measurement before diagnosis (facts only)
+Every claim about system state must be backed by a read-only command output in the same
+exchange. No diagnosis from theory. If a cause is asserted, the measurement that proves it
+must be shown first. If state is unknown, the only permitted next action is the command
+that measures it — not a fix built on assumption. Enforcement phrase: if the operator says
+"measurement?" and none was shown, the rule was broken — go measure before proceeding.
+
+### Step back to the last action when something breaks
+When something that was working breaks, return to the last action taken. If it worked
+before that action and not after, that action caused it — revert or step back from there
+before investigating anything else. Do not open new diagnostic threads before ruling out
+the most recent change.
+
+### One restart, then verify — never restart-storm
+Never issue repeated `systemctl restart argonaut.service` in quick succession. Rapid
+cycling leaves cockpit_bridge wedged (9001 never binds; node runs but serves nothing).
+Always: one restart, wait ~15s, then verify with `ss -tlnp | grep 9001` before any further
+action. Only one restart is in flight at a time.
+
+### Cockpit widget re-import — full quit after JS changes
+When a Cockpit DIY widget's JS changes (not just html/css), a delete + re-import inside the
+running app can leave the old script's setInterval timer alive in the background, so old
+and new timers both write to the DOM and fields flicker. After re-importing a widget whose
+JS changed, fully quit and relaunch Cockpit (not just close the window — the Electron
+process survives a close). html/css-only changes do not need this.
+
 ### Lead with context and corrections BEFORE instructions, never after.
 
 ### Copy-paste friendly commands
@@ -320,11 +351,14 @@ backup because this was deferred — do not repeat.
 ---
 
 ## Documentation discipline
-- All project docs (handover, UI design, DIR, this file, sim/ML plan) are maintained as
-  COMPLETE replacement files uploaded to Claude project knowledge — never patches or
-  fragments, never committed to Gitea.
+- Other project docs (handover, UI design, DIR, sim/ML plan) are maintained as COMPLETE
+  replacement files uploaded to Claude project knowledge — never patches or fragments,
+  never committed to Gitea.
+- CLAUDE.md is different: it IS version-controlled and committed to Gitea like any other
+  repo file (normal patch/diff edits and commits apply to it, not the replacement-file
+  workflow above).
 - Version numbers and changelogs maintained on every update.
-- Only code and README files go to Gitea.
+- Only code, README files, and CLAUDE.md go to Gitea.
 
 ---