feat: add sparv enhanced rules v1.1

- Add Uncertainty Declaration (G3): declare assumptions when score < 2
- Add Requirement Routing: Quick/Full mode based on scope
- Add Context Acquisition: optional kb.md check before Specify
- Add Knowledge Base: .sparv/kb.md for cross-session patterns
- Add changelog-update.sh: maintain CHANGELOG by type

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Co-Authored-By: SWE-Agent.ai <noreply@swe-agent.ai>

skills/sparv/SKILL.md

@@ -17,6 +17,56 @@ Goal: Complete "requirements → verifiable delivery" in one pass, recording key
 - **EHRB**: Require explicit user confirmation when high-risk detected (production/sensitive data/destructive/billing API/security-critical).
 - **Fixed Phase Names**: `specify|plan|act|review|vault` (stored in `.sparv/state.yaml:current_phase`).
 
+## Enhanced Rules (v1.1)
+
+### Uncertainty Declaration (G3)
+
+When any Specify dimension scores < 2:
+- Declare: `UNCERTAIN: <what> | ASSUMPTION: <fallback>`
+- List all assumptions in journal before Plan
+- Offer 2-3 options for ambiguous requirements
+
+Example:
+```
+UNCERTAIN: deployment target | ASSUMPTION: Docker container
+UNCERTAIN: auth method | OPTIONS: JWT / OAuth2 / Session
+```
+
+### Requirement Routing
+
+| Mode | Condition | Flow |
+|------|-----------|------|
+| **Quick** | score >= 9 AND <= 3 files AND no EHRB | Specify → Act → Review |
+| **Full** | otherwise | Specify → Plan → Act → Review → Vault |
+
+Quick mode skips formal Plan phase but still requires:
+- Completion promise written to journal
+- 2-action save rule applies
+- Review phase mandatory
+
+### Context Acquisition (Optional)
+
+Before Specify scoring:
+1. Check `.sparv/kb.md` for existing patterns/decisions
+2. If insufficient, scan codebase for relevant files
+3. Document findings in journal under `## Context`
+
+Skip if user explicitly provides full context.
+
+### Knowledge Base Maintenance
+
+During Vault phase, update `.sparv/kb.md`:
+- **Patterns**: Reusable code patterns discovered
+- **Decisions**: Architectural choices + rationale
+- **Gotchas**: Common pitfalls + solutions
+
+### CHANGELOG Update
+
+Use during Review or Vault phase for non-trivial changes:
+```bash
+~/.claude/skills/sparv/scripts/changelog-update.sh --type <Added|Changed|Fixed|Removed> --desc "..."
+```
+
 ## External Memory (Two Files)
 
 Initialize (run in project root):