Rename project to OBDash + per-metric colored multi-axis

Rename: the app is vehicle-agnostic, so 'ford-obd' was wrong. Rebranded all
code/docs/profile authors to OBDash; Gitea repo renamed justin/ford-obd ->
justin/obdash (remote + description updated). Ford the make and the
ford-6.0-powerstroke profile are unchanged (that vehicle really is a Ford).

Multi-axis upgrade (per request):
- MultiAxisPlot now gives each METRIC its own Y axis, each axis colored to
  match its line; the primary metric owns the LEFT axis, others stack right.
- Click a line to promote it to the left axis (sigClicked -> set_primary).
- Cleaner teardown (no removeItem warnings); axis label no longer doubles the
  unit; Normalize round-trips.

Validated headless: colored per-metric axes, promote-to-left, gauge view,
normalize toggle, profile switch; obdcore + diagnostics tests pass.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016yT89n4zR4qbrySoSiEyZs

handoff.md

@@ -1,6 +1,6 @@
-# Handoff — ford-obd / 6.0 Power Stroke no-start
+# Handoff — OBDash / 6.0 Power Stroke no-start
 
-Pick-up notes for diagnosing the truck in the cab. Repo: `git.jpaul.io/justin/ford-obd` (private).
+Pick-up notes for diagnosing the truck in the cab. Repo: `git.jpaul.io/justin/obdash` (private).
 
 ## TL;DR — what to do at the truck
 1. CH340 ELM327 adapter → OBD port (under dash, driver side).
@@ -78,10 +78,10 @@ The 6.0 needs, to fire: **good batteries → FICM ~48V → ICP ~500 psi → fuel
   [crank-test-2026-06-30.txt](diagnostics/2026-06-29-no-start/crank-test-2026-06-30.txt).
   Next: physical inspection (IPR valve first, then STC fitting, then
   oil rail O-rings).
-- Pushed to `git.jpaul.io/justin/ford-obd`, branch `main`.
+- Pushed to `git.jpaul.io/justin/obdash`, branch `main`.
 
 ## To resume with Claude from the cab
-Mention: "6.0 Power Stroke no-start, using the ford-obd tool (git.jpaul.io/justin/ford-obd)".
+Mention: "6.0 Power Stroke no-start, using the OBDash tool (git.jpaul.io/justin/obdash)".
 Then **paste the tool's full output** (codes + live values). Useful to also say: cranks vs.
 no-crank, hot vs. cold, what changed before it died, and FICM/ICP readings if you metered them.