Epic: #268 | Phase: 5 — Polish | Priority: P2

R9.1 — Audit unused dependencies [M]

Run cargo machete to identify unused deps. Suspects: pulldown-cmark in zeph-tui, eventsource-stream in zeph-a2a.

R9.2 — Dead public functions audit [M]

Check for unused pub fn across workspace, especially zeph-memory/src/sqlite.rs (25+ public functions).

R10.2 — Integration test expansion [L]

Add integration tests for: full agent loop, MCP client lifecycle, A2A protocol, skill hot-reload.