Bug

After PR #1900 (context compression), [agent.focus] and [memory.sidequest] config sections are parsed but never passed to the agent — both always use defaults (enabled = false).

Root Cause

AgentBuilder::with_focus_config() and AgentBuilder::with_sidequest_config() are defined in crates/zeph-core/src/agent/builder.rs:565-575 but are never called from bootstrap (crates/zeph-core/src/bootstrap/).

Agent::default() in agent/mod.rs:586-587 uses FocusState::default() and SidequestState::default(), which have enabled = false.

Evidence

With config:

[agent.focus]
enabled = true
compression_interval = 5

[memory.sidequest]
enabled = true
interval_turns = 3

Output of /focus and /sidequest:

Focus Agent status
Enabled:          false   ← should be true

SideQuest status
Enabled:        false     ← should be true
Interval turns: 4         ← should be 3 (from config)

Fix

In the bootstrap AppBuilder (where it constructs AgentBuilder), pass the parsed config:

// crates/zeph-core/src/bootstrap/...
agent_builder = agent_builder
    .with_focus_config(config.agent.focus.clone())
    .with_sidequest_config(config.memory.sidequest.clone());

Impact

• Focus Agent completely non-functional (cannot be enabled via config)
• SideQuest completely non-functional (cannot be enabled via config)
• start_focus/complete_focus tools and automatic focus suggestions never trigger
• SideQuest eviction never runs regardless of config

Severity

High — new PR #1900 features (Focus Agent, SideQuest) are effectively dead-on-arrival; config has no effect.