Summary

• Add four functional probe dimensions (Recall, Artifact, Continuation, Decision) to the compaction probe pipeline with per-category scoring breakdown
• New probe_provider config field in [memory.compression.probe] resolves from [[llm.providers]] at startup (follows build_judge_provider pattern); old dead model field removed
• TUI memory panel shows per-category scores (Rec/Art/Con/Dec) with threshold-based color coding using compaction_probe_threshold from MetricsSnapshot

Changes

crates/zeph-memory/src/compaction_probe.rs

• ProbeCategory enum with #[serde(rename_all = "lowercase")]
• CategoryScore struct (category, score, probes_run)
• ProbeQuestion.category field with #[serde(default = "default_probe_category")] (backward compat: defaults to Recall)
• CompactionProbeResult.category_scores with #[serde(default)] (backward compat with old JSON)
• CompactionProbeConfig: probe_provider: String, category_weights: Option<HashMap<ProbeCategory, f32>>; model field removed (was dead code, never read at call site)
• compute_category_scores(): weighted average with zero-weight fallback; tracing::warn on negative weights
• run_probe(): empty summary guard (< 10 chars), missing-category warn when max_questions >= 4, category-aware LLM prompt

crates/zeph-core/src/metrics.rs

• last_probe_category_scores: Option<Vec<CategoryScore>>
• compaction_probe_threshold: f32, compaction_probe_hard_fail_threshold: f32

crates/zeph-core/src/agent/context/summarization.rs

• Sets last_probe_category_scores, compaction_probe_threshold, compaction_probe_hard_fail_threshold in all verdict branches

crates/zeph-tui/src/widgets/memory.rs

• render_probe_last_line(): appends Rec:X.XX Art:X.XX Con:X.XX Dec:X.XX with threshold-based color; absent categories show --
• New snapshot test probe_lines_with_category_scores

crates/zeph-core/src/debug_dump/mod.rs

• dump_compaction_probe() includes category_scores array and category per question

crates/zeph-core/src/bootstrap/mod.rs

• build_probe_provider(): resolves probe_provider name at startup, returns Option<AnyProvider>

crates/zeph-core/src/agent/{builder,state/mod,mod}.rs

• ProviderState.probe_provider: Option<AnyProvider>, with_probe_provider() builder, probe_or_summary_provider() fallback

src/{runner,daemon,acp}.rs

• Wire build_probe_provider() in all three entry points

src/init.rs

• Replace probe_model with probe_provider in wizard state and prompts

Test plan

• cargo +nightly fmt --check — clean
• cargo clippy -p zeph-memory -p zeph-core -p zeph-tui -- -D warnings — clean
• cargo nextest run --workspace --lib --bins — 6050 passed, 15 skipped
• New unit tests: ProbeCategory serde, category_weights TOML round-trip, compute_category_scores (equal weights, custom weights, zero-weight fallback, missing category, multi-probe average), backward compat deserialization (old JSON without category_scores/category fields)
• New TUI snapshot: probe_lines_with_category_scores

Closes #2164