#231 docs(contributors): add the eight contributors missing from the list

[Anonymous]

Originally created by: fu351

What this PR does

CONTRIBUTORS.md listed three people, while ten non-maintainer contributors have landed merged PRs. This adds the eight who were missing and keeps the list alphabetical by handle.

Added, with the merged work that qualified them:

Handle	Merged work
@averyquinnhq	[#181] — Windows venv activation in CONTRIBUTING
@harshitagrawal2O	[#152] — Windows CI leg + cross-drive key fix
@jasperdingg	[#221] — exhaustive raise-only reduction test
@navaneethsankar07	[#216] — targeted test-selection guide
@QY-25123	[#102] — CostObserver plugin seam; [#220] — package smoke test
@Shihasz	[#183] — PATH-shadowing troubleshooting; [#219] — ReasonCode drift test
@snowyukitty	[#132] — custom Guardrail tutorial; [#184] — help smoke test
@stevenmini2019	[#99] — Azure & GCP service-account key patterns

Every one of these is a merged PR that changed behavior, added a real test, added a CI check, or documented a guarantee — the bar in CLAUDE.md §8b step 6.

@leemeo3 and @Tian-Tan stay as they are; the file credits review, testing and ideas as well as code.

Tests added (run in CI)

• None. Documentation only, no behavior change.

Security checklist

• [x] Fails closed on error / uncertainty — N/A, docs only
• [x] No secret, full file, or unredacted prompt logged or committed
• [x] Any guardrail/learning change is raise-only (no silent loosening) — N/A
• [x] Every BLOCK/AUTH carries reason codes + a human explanation — N/A

[Anonymous]

Ticket changed by: fu351

• status: open --> closed