chore: update dependencies + improve recall skill and search logging

[lklimek]

Summary

• Update all 37 workspace dependencies to latest compatible versions via cargo update
• Task-aware recall skill: Rewrite skills/recall/SKILL.md to guide task-specific keyword extraction instead of generic "project context" queries. Adds multi-pass search strategy (task query first, broad context fallback only if needed) with good/bad query examples
• Search result logging: Add info!() tracing to search_memories() and unified search() handlers in serve.rs — logs query text, result count, and top relevance score for quality analytics

Context

Analytics of 4,534 Claude Code sessions showed:

• 78% of agent sessions never call memcan (not due to missing access — all agents have tools)
• 5.5% of all searches used the generic query "project context"
• No server-side metrics existed to measure search result quality

These changes address the root causes: vague queries (recall skill) and unmeasurable quality (logging).

Verification

Check	Status
cargo build --workspace	PASS
cargo test --workspace	PASS (19 passed, 0 failed)
cargo clippy --workspace --all-targets -- -D warnings	PASS (0 warnings)
cargo fmt --all -- --check	PASS

Merge Strategy

Intended for squash merge.

_{🤖 Co-authored by Claudius the Magnificent AI Agent}