v2.2.0

What's New in v2.2.0

Predictive Planning & Knowledge (Spec 39)

• Duration-based task ordering — ready tasks sorted by predicted duration (longest first) to minimize wall-clock time, with regression model, historical median, and configurable presets as fallback chain
• Causal graph + review findings — review/drift/verification findings integrated into causal traversal for richer downstream context
• Confidence-aware fact selection — facts below a configurable confidence threshold are excluded from session context
• Pre-computed ranked facts — fact rankings cached at plan time for faster context assembly
• Cross-group finding propagation — critical findings from earlier task groups visible to downstream groups under "Prior Group Findings"
• Project model — aggregate spec outcomes, module stability scores, and archetype effectiveness via agent-fox status --model
• Critical path forecasting — identifies the longest-duration path through the task graph with tied-path detection
• File conflict detection — predicts file overlaps between parallel tasks and serializes conflicting pairs (opt-in)
• Learned blocking thresholds — adapts skeptic/oracle block thresholds from historical precision (opt-in)

Confidence Normalization (Spec 37)

• Unified confidence representation as float [0.0, 1.0] across memory, knowledge, and routing
• parse_confidence() function handles string enum → float conversion with canonical mapping
• DuckDB migration v5: TEXT → DOUBLE for confidence columns
• JSONL backward compatibility preserved

DuckDB Hardening (Spec 38)

• DuckDB is now a hard requirement — open_knowledge_store() raises RuntimeError instead of returning None
• Removed all Optional connection parameters from session lifecycle, knowledge harvest, memory store, context assembly, and routing
• DuckDB errors propagate instead of being silently swallowed
• Added knowledge_conn / knowledge_db test fixtures for isolated in-memory DuckDB

Other Changes

• Hard reset (Spec 35) — agent-fox reset --hard with commit SHA tracking
• Config generation (Spec 33) — agent-fox init generates config.toml from schema
• Token tracking (Spec 34) — per-archetype and per-spec cost breakdowns in status
• Oracle archetype (Spec 32) — drift detection agent with blocking logic
• Prompt rewrites — oracle, librarian, cartographer, coordinator prompts rewritten to gold standard pattern
• AGENTS.md rewrite — project-specific conventions documented
• Harvest reconciliation (Spec 36) — post-harvest develop branch reconciliation