feat: ACP server + cron timezone fix

[teknium1]

Two features in one PR

1. fix(cron): handle naive legacy timestamps in due-job checks

Cherry-picked from PR #807 by @0xNyk with 3 additional regression tests.

2. feat: ACP (Agent Client Protocol) server for editor integration

Based on PR #837 by @teknium1, with complete implementation of the prompt flow.

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ACP Implementation (~1200 lines)

Adds full ACP support, enabling hermes-agent to work as a coding agent inside VS Code, Zed, JetBrains IDEs, and any ACP-compatible editor.

User Flow

1. hermes is already installed
2. pip install -e '.[acp]'
3. Install ACP Client extension in VS Code
4. Add to settings: point to acp_registry/ directory
5. Open ACP panel → Select hermes → Start chatting

Architecture (acp_adapter/)

File	Lines	Purpose
server.py	280	HermesACPAgent — all 15 Agent protocol methods
session.py	120	Thread-safe SessionManager with per-session AIAgent
events.py	170	Callback → ACP notification bridging
tools.py	200	Tool kind mapping (25+ tools) + content builders
permissions.py	80	Approval bridging → editor permission dialogs
auth.py	26	Provider credential detection
entry.py	86	CLI entry point

Key Features

• Full prompt flow: AIAgent runs in thread executor, streams tool events, thinking, and messages back in real-time
• Tool events with kinds: read/edit/execute/search/fetch/think mapped for 25+ hermes tools
• Diff content for file edits (patch, write_file)
• Permission bridging: dangerous commands → editor approval dialog
• Session lifecycle: new, load, resume, list, fork, cancel
• Model switching support
• No modifications to run_agent.py — works entirely through existing callback system

Also includes

• jupyter-live-kernel skill for data science workflows
• acp_registry/ with agent.json for editor auto-discovery
• docs/acp-setup.md setup guide (VS Code, Zed, JetBrains)
• hermes acp CLI subcommand

What was fixed from the original PR #837

• Fixed broken imports in events.py (4 of 5 imported names didn't exist)
• Implemented prompt() (was a placeholder returning empty response)
• Made all Agent methods async (ACP SDK requires it)
• Added load_session/resume_session support
• Removed dead _acp_tool_bridge hook from run_agent.py
• Expanded TOOL_KIND_MAP from 7 to 25+ tools
• Added make_tool_call_id and build_tool_title functions
• Added result truncation for large tool outputs
• Added events.py tests (were completely missing)

Tests

• 81 new ACP tests + 3 cron timezone regression tests
• Full suite: 3330 passed, 16 skipped (2 pre-existing unrelated failures)

Fixes #806
Closes #807
Closes #837

Co-authored-by: 0xNyk 0xNyk@users.noreply.github.com