fix(agent): refresh delegate_{toolkit} tools on first turn for web channel

[graycyrus]

Summary

• Adds refresh_delegation_tools() on Agent, called after fetch_connected_integrations() on the first turn — re-synthesises skill-delegation tools (delegate_gmail, delegate_notion, …) with the live integrations list and merges them into the tool schema before the system prompt is built
• Adds base_definition_id field to Agent to preserve the original definition ID through the web channel's set_agent_definition_name() mangling ("orchestrator" → "orchestrator_thread-6ad...")
• Updates the &[] comment at the collect_orchestrator_tools call sites to document the refresh contract

Root cause

PR #1314 removed spawn_subagent from the orchestrator's allowed tools and rewrote the integrations prompt to advertise delegate_{toolkit} tools. The synchronous builder (builder.rs) passes &[] for connected integrations (can't call async Composio API), so zero skill-delegation tools are registered. Meanwhile fetch_connected_integrations() populates the prompt correctly — the model sees delegate_gmail in prose but can't call it, falling through to delegate_tools_agent which refuses.

Changes

File	Change
types.rs	base_definition_id field on Agent + AgentBuilder
builder.rs	Wire base_definition_id, update &[] comments
turn.rs	refresh_delegation_tools() method + call on first turn
runtime.rs	base_definition_id() accessor
tests.rs	3 tests: populates tools, noop when empty, no duplicates

Test plan

• refresh_delegation_tools_populates_skill_tools — connected gmail + github → delegate_gmail and delegate_github appear in tool schema
• refresh_delegation_tools_noop_when_no_integrations — empty integrations = no-op
• refresh_delegation_tools_skips_already_registered — calling twice doesn't duplicate tools
• cargo check (core + Tauri shell) passes
• cargo test — 6566 passed, 1 pre-existing failure (unrelated config test)
• cargo fmt --check passes
• pnpm typecheck / pnpm lint / pnpm format:check pass

Closes #1659

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[senamakel]

this is kidna fixed now in #1670