feat: Computer Use Tool — macOS desktop control via Anthropic native API

Salvaged from PR #3816 by 0xbyt4. Stripped unrelated changes (telegram
thread retry, cache logging in quiet_mode), preserved existing beta
headers (interleaved-thinking, fine-grained-tool-streaming), and
rebased onto current main.

New computer_use toolset:
- Screenshot capture via macOS native screencapture + sips
- Mouse: click, double/triple/right/middle click, drag, move
- Keyboard: type text (clipboard paste for Unicode), key combos
- Zoom for inspecting small screen regions at full resolution
- Auto-screenshot after destructive actions (saves API round-trips)

Architecture:
- Dual-schema: stub (OpenAI format) for dispatch + native
  (computer_20251124) injected into Anthropic API calls
- Provider gating: stripped from non-Anthropic providers at init
- Beta API routing: messages.create → beta.messages.create when
  native tools present (both streaming and non-streaming)
- Multimodal results: _anthropic_content_blocks on tool messages,
  content stays string for session DB / trajectory compatibility

Token optimization:
- Server-side context editing (context-management-2025-06-27 beta)
- Client-side screenshot-aware pruning in context compressor
- Image eviction: keeps only 3 most recent screenshots
- Image-aware token estimation (flat 1500 tokens per image)

Safety:
- Hard-blocked key combos (empty trash, force delete, lock screen)
- Blocked type patterns (curl|bash, sudo -S -p '' rm -rf, privilege escalation)
- Anti-injection system prompt guidance
- Approval callback wired (disabled during beta)

Includes: 102 tests, 657-line macOS workflow skill (auto-loaded),
feature docs page, reference catalog updates.

website/docs/reference/toolsets-reference.md

@@ -13,6 +13,7 @@ Toolsets are named bundles of tools that you can enable with `hermes chat --tool
 | `browser` | core | `browser_back`, `browser_click`, `browser_close`, `browser_console`, `browser_get_images`, `browser_navigate`, `browser_press`, `browser_scroll`, `browser_snapshot`, `browser_type`, `browser_vision`, `web_search` |
 | `clarify` | core | `clarify` |
 | `code_execution` | core | `execute_code` |
+| `computer_use` | core | `computer` |
 | `cronjob` | core | `cronjob` |
 | `debugging` | composite | `patch`, `process`, `read_file`, `search_files`, `terminal`, `web_extract`, `web_search`, `write_file` |
 | `delegation` | core | `delegate_task` |