feat(agent): web.search / web.fetch via Brave Search (WEB-1)

- adapters/websearch: Brave client (X-Subscription-Token, error classes),
  result normalization with redaction/truncation, SSRF guard, HTML→text fetch
  (10s, 512KB, text/html|text/plain only)
- modules/websearch: 10-min PG cache (region websearch), cross-process
  per-minute limit, web.fetch allowlist = URLs from the caller's latest
  web.search; POST /websearch/test
- settings.agent.webSearch (key write-only → secret_ref); settings card
  under Agent; web.* offered to the model only when enabled, plus a system
  prompt rule; outputs marked untrusted
- capability count 27 → 29; e2e E13; runbook docs/runbook/websearch.md

Co-Authored-By: Claude Opus 5.5 <[email protected]>
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rootandClaude Opus 5.5 committed 2026-09-29 00:14:08 +08:00
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@@ -35,6 +35,8 @@ const STRING_CANDIDATES = [
"123456",
`lib:${UUID}`,
"30 3 * * *",
"ALL",
"zh-hans",
];
const NUMBER_CANDIDATES = [1, 50, 2024, 0.5, 0, 4096, 128000];