agent-loop: Skald adapters behind the crate traits (phase 1)

New skald-core::loop_adapters module — implements the agent-loop trait
surface over existing infrastructure, unused by the current loop (wired
in phase 2):

- SqliteHistory: HistoryStore over chat_sessions_stack/chat_history/
  chat_llm_tools/chat_summaries, no schema change; CallState maps 1:1 on
  the existing status strings; wire call ids synthesized as tc_{id}
- SkaldSelector: ModelSelector over LlmManager with the agent's strength
  captured per-turn (D14); DtlMode → ToolRendering mapping (D15)
- SkaldActivationSource + SkaldToolActivator: DTL catalog + persistence
  (activated_tools, anchored at the triggering message) behind the
  crate's protocol traits; unifies the grants/persistence split
- ApprovalGate: port of run_approval_gate (pre-approved, engine, fs
  fast-path, auto-deny, AwaitingHuman + block on human); a closed human
  channel maps to the new GateDecision::Suspend in agent-loop
- SkaldToolSet + CoreToolBridge/McpToolBridge: core-api and MCP tools
  run inside the crate's kernel (execution bridged, execute_cmd keeps
  its teardown; D7 MarkInterrupted for shell)
- agent-loop: re-export async_trait at root; EventSink::new made public

17 adapter tests green (temp-DB integration); full workspace suite green
(pre-existing honcho-client doc-test failure untouched: missing dev-deps).

crates/skald-core/src/loop_adapters/mod.rs

@@ -0,0 +1,22 @@
+//! Skald-side adapters implementing the `agent-loop` trait surface over the
+//! existing infrastructure (blueprint §14 phase 1). **Unused by the current
+//! loop** — they compile and are unit-tested here, and get wired in phase 2.
+//!
+//! - [`history::SqliteHistory`] — `HistoryStore` over the existing
+//!   `chat_sessions_stack` / `chat_history` / `chat_llm_tools` / `chat_summaries`
+//!   tables (no migration, §0).
+//! - [`selector::SkaldSelector`] — `ModelSelector` over `LlmManager`, with the
+//!   agent's strength captured per-turn (D14).
+//! - [`gate::ApprovalGate`] — `Gate` over `ApprovalManager` + the RunContext
+//!   fast-path + auto-deny + pre-approved (port of `handler/gate.rs`).
+//! - [`toolset::SkaldToolSet`] — `ToolSet` over base/config defs + MCP grants +
+//!   memory/image/interface tools, with DTL rendering (port of
+//!   `AgentRunConfig::all_tool_defs`), plus the core-api→agent-loop tool bridge.
+//! - [`activation`] — `ActivationSource` + `ToolActivator` over the
+//!   `activated_tools` table and the MCP provider (D15).
+
+pub mod activation;
+pub mod gate;
+pub mod history;
+pub mod selector;
+pub mod toolset;