feat(discover): rewrite bunx prisma → rtk prisma

[YOMXXX]

Summary

Bun is the primary JS runtime on a growing share of Prisma projects. `bunx prisma <sub>` is semantically equivalent to `npx prisma ` — same CLI, same output format, same subcommands — but the hook didn't recognise it, so the reporter's 45 monthly `bunx prisma` invocations (#1401) were flowing through the Bash hook completely unfiltered.</sub>

Fix

One `RtkRule` change in `src/discover/rules.rs`:

```diff

• pattern: r"^((p?np(m|x)|p?npm\s+(exec|run|run-script)|npm\s+(rum|urn|x)|pnpm\s+dlx)\s+)?prisma",

• pattern: r"^((p?np(m|x)|p?npm\s+(exec|run|run-script)|npm\s+(rum|urn|x)|pnpm\s+dlx|bunx)\s+)?prisma",
  rtk_cmd: "rtk prisma",
  rewrite_prefixes: &[

•    "bunx prisma",
     "npm exec prisma",
     …
  

  ],
  ```

No new output-filtering logic — the entire Bun-Prisma stack goes through the same `src/cmds/js/prisma_cmd.rs` handler as npx/pnpm/npm; only the rewrite recognition was missing.

Behaviour

Input	After
`bunx prisma migrate dev`	`rtk prisma migrate dev`
`bunx prisma migrate dev --name add_col`	`rtk prisma migrate dev --name add_col`
`bunx prisma migrate deploy`	`rtk prisma migrate deploy`
`bunx prisma migrate status`	`rtk prisma migrate status`
`bunx prisma generate`	`rtk prisma generate`
`bunx prisma db seed`	`rtk prisma db seed`
`bunx prisma studio`	`rtk prisma studio`

`npx prisma` / `pnpm prisma` / `pnpm dlx prisma` continue to work exactly as before — same rule, just one more alternation branch.

Scope notes

• This PR is intentionally narrow: it only adds `bunx` to the existing Prisma rule. Other `bun` runner forms (`bun x`, `bun run`, bare `bun prisma`) are not covered here; if usage data shows they matter we can extend the alternation in a follow-up.
• Other RTK-handled binaries that ship as `bunx ` (vitest, playwright, tsc, prettier, biome, jest, eslint…) are out of scope. The reporter only flagged Prisma — happy to do a sweep in a separate PR if maintainers want broad bun adoption.

Test plan

• `test_classify_prisma` and `test_rewrite_prisma` extended with `bunx prisma` (locks the invariant fence per runner).
• New `test_rewrite_bunx_prisma_subcommands` covers the six subcommand shapes the reporter named.
• `cargo fmt --all` clean.
• `cargo clippy --all-targets` zero warnings.
• `cargo test --bin rtk -- --test-threads=8` → 1910 passed.

Fixes #1401