root aa9cf0917e fix(auth): O(1) selector+verifier token verification ...

verifyToken loaded every non-revoked token and bcrypt-compared each (O(n) per
request — auth-latency DoS + linear scaling). New token format
vk_<selector>.<verifier>: the non-secret selector is indexed and locates exactly
one row; only the verifier is bcrypt-hashed. Legacy NULL-selector tokens still
verify via a fallback scan. Dropped the useless idx_agent_tokens_hash.

- migration 010_token_selector.sql (adds selector col + unique partial index)
- createToken/verifyToken reworked; also adds listTokenMeta (read for Yerin's
  token_audit tool)
- tests/repos/token_selector.test.js

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-06-02 00:17:45 +10:00

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