feat: add deno and bun test adapters

[daichunghy]

Summary

Closes #14
Closes #15

Adds exact-argv bundled adapters for Bun and Deno projects:

• bun test for bun.lockb, bun.lock, or a package manifest declaring Bun
• deno test for deno.json or deno.jsonc

The adapters reject extra arguments and shell syntax, and execute only after explicit --run-tests
opt-in. Fixtures cover positive markers, false positives and execution boundaries.

Verification

• npm run verify
• 41 tests across 9 files
• typecheck/build pass
• git diff --check passes

Boundary

Bun and Deno runtimes were not installed locally, so execution is verified through the injected
executor and exact argv boundary. No external adapter adoption or npm publication is claimed.

[daichunghy]

Superseded by #29, which integrates the Bun/Deno and Elixir/Maven adapter waves into one 7-adapter branch and resolves the cross-PR test-order conflict.