feat: http_post tool, nc_talk_history tool, local orchestrator retry
- http_post: POST to external URLs with per-user URL prefix allowlist
(home/{user}/http_allowlist.json); admin-only, confirm-required
- nc_talk_history: read recent NC Talk messages via Basic Auth (requires
nc_username + nc_app_password in channels.json under nextcloud)
- openai_orchestrator: _chat_with_retry() wraps both API calls with
exponential backoff (3 attempts, 1s/2s) on connection errors and
transient status codes (429, 500, 502, 503, 504)
- Docs updated: CLAUDE.md, HELP.md, TODO, MASTER, ROADMAP (50 tools)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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