experiment: rename rust-ci.yml → rust-ci-v2.yml to force fresh GH workflow_id

Hypothesis: GH Actions cached the path-based fallback name on
workflow_id 231679368 (created 2026-02-07 with the old self-contained
rust-ci.yml content) and never re-parsed after the thin-wrapper
conversion landed (2026-05-26). All subsequent pushes produce 0s-duration
"completed failure" runs because GH treats the workflow definition as
unparseable.

Evidence:
- /repos/.../actions/workflows/231679368 returns name=".github/workflows/rust-ci.yml"
  (path-based fallback), not "Rust CI" (YAML name field).
- governance.yml (workflow_id 278098065, created 2026-05-17 as a fresh
  thin wrapper) returns name="Governance" correctly — same caller
  pattern, no caching issue.
- Disable+enable via API did NOT force re-parse.
- panic-attack#84 + #92 SHA bumps did NOT fix it.

Experiment: rename the file. If GH creates a new workflow_id and
correctly parses "Rust CI" as the name, hypothesis 3 from standards#322
is confirmed and the fix is an estate-wide rename across all 43+ rust-ci
callers.

Companion to standards#322 root-cause investigation.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hyperpolymath