CI: two checks red on main — language-policy drift in .claude/CLAUDE.md; gossamer-rs build script fails in rust-ci #83

Both are red on main @ 1242b45 and on every PR (seen on Dependabot PR #82, whose diff is CI-only). Neither is a required context.

1. governance / Language / package anti-pattern policy

checking .claude/CLAUDE.md
  FAIL .claude/CLAUDE.md   No Bun entry appears in the allowed policy.
  FAIL .claude/CLAUDE.md   Deno is not listed as banned with Bun as its replacement.
Language-policy drift detected. Fix the local copy; do not weaken this gate.

2. rust-ci / Cargo check + clippy + fmt

error: failed to run custom build command for `gossamer-rs v0.1.0 (https://github.com/metadatastician/gossamer.git?rev=73d8c077…)`
  process didn't exit successfully: …/build-script-build (exit status: 101)

The git dependency's build script panics on the runner (likely a missing system toolchain or a path the build script assumes).

Acceptance criteria

• .claude/CLAUDE.md lists Bun as allowed and Deno as banned with Bun as the replacement, matching the estate language policy; the anti-pattern check is green on main.
• gossamer-rs builds in CI (install what its build script needs, or bump to a rev whose build script works), and rust-ci / Cargo check + clippy + fmt is green on main.

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