Enhance native toolset and add persistent KV store ...

- Add PostgreSQL-backed KvStore (navi/store/) for session-scoped data.
- Migrate todo and scratchpad from in-memory dicts to KvStore.
- Filesystem: add copy, grep, diff actions; compress description.
- CodeExec: remove language param, expose working_dir in schema.
- ImageView: resize to 1024px JPEG + Content-Type guard for URLs.
- Memory list: return distinct categories instead of all facts.
- SSH: add scp action with upload/download support.
- Update CLAUDE.md (Postgres-only), docs/tools.md, add docs/store.md.
- Fix agent/planning/context_builder async signatures for todo helpers.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Refactor: move tool helper modules into _internal subpackage ...

Moves non-tool infrastructure out of navi/tools/ root so that only
actual tool classes live there:

  base.py           → _internal/base.py
  loader.py         → _internal/loader.py
  middleware.py     → _internal/middleware.py
  logging_middleware.py → _internal/logging_middleware.py
  _time_parser.py   → _internal/time_parser.py

All imports updated across core/, api/, mcp/, tools/, and tests/.
No proxy files remain in navi/tools/ root.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Architecture cleanup: old_webclient, SSH shutdown, todo decoupling, ContextVar reset ...

- Remove old_webclient directory and /static mount from main.py
- Add shutdown handler in main.py to close all SSH pooled connections
- Decouple agent.py from todo module internals:
  - Add public API to navi/tools/todo.py: get_task_snapshot, get_failed_steps,
    get_progress_message, set_tasks, render_todo_lines
  - Replace all direct _plans/_STATUS_ICON/_Task imports in agent.py with API calls
- Wrap run_ephemeral in try/finally to restore _sid_var and _model_var after subagent

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Fix ssh_exec: is_closing() → is_closed() (asyncssh API) ...

SSHClientConnection has no is_closing() — that's asyncio Transport.
The correct public method is is_closed().

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Fix ssh_exec error reporting + circular import in switch_profile ...

ssh_exec:
- Non-zero exit status: output (stdout/stderr) now included in error
  field so model can actually see why the command failed
- All error cases: error field now contains human-readable message
  instead of short code (no_target, permission_denied, timeout)
- Named connections from ssh_hosts.json: default known_hosts=none
  same as ad-hoc connections (was missing, caused host key failures)

switch_profile:
- Move ProfileSwitched import inside execute() to break circular
  import: tools.__init__ → switch_profile → core.events → core.agent
  → core.registry → tools

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

SSH connection pooling: per-session, 20-minute TTL ...

- Pool keyed by session_id:host:port:username — parallel sessions share
  no state even when targeting the same server
- Per-key asyncio.Lock prevents concurrent connection creation races
- TTL (20 min) and is_closing() checked on every access; expired/closed
  connections are evicted and replaced transparently
- On disconnect error during command execution: evict + retry once with
  fresh connection
- current_session_id ContextVar (set by Agent before tool calls) is read
  in ssh_exec to build the pool key without changing tool signatures

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Wire self-extension tools into all profiles; improve tool descriptions ...

All profiles now include write_tool, list_tools, tool_manual, reload_tools.
User tools from enabled.json merged in at runtime via Agent._tool_list().
Built-in tool descriptions rewritten to be more LLM-actionable.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

ssh_exec: accept credentials directly as tool parameters ...

host, username, password, port, key_path are now first-class parameters.
No config file needed — user can pass creds in the chat message.
Ad-hoc connections skip host key verification by default.
Named connections in ssh_hosts.json still work as a shortcut.

Fix SSH password auth: disable key lookup when password is configured ...

asyncssh tried ~/.ssh/* keys before the password, causing PermissionDenied
on hosts that only accept password auth. Now when 'password' is set and no
'client_keys', key auth is disabled entirely.

Unrestricted terminal mode and SSH tool ...

- Terminal: TERMINAL_ALLOWED_COMMANDS=* (default) runs via shell,
  supports pipes, redirects, subshells; allowlist mode still available
- FS_ALLOWED_PATHS expanded to cover /home /etc /var /opt
- New ssh_exec tool: execute commands on remote hosts via asyncssh,
  supports named connections (ssh_hosts.json) and inline user@host
- ssh_hosts.json gitignored, ssh_hosts.json.example added as reference
- ssh_exec added to server_admin and smart_home profiles