chore: update skill activation rule

rules/skill-activation.md

@@ -1,14 +1,22 @@
 # Skill Activation
 
-**Evaluate before implementing** - Check available skills for relevance before starting work
+**Evaluate on every prompt** - Before any response, tool call, or action, check available skills for relevance
 
 **Activation sequence:**
 
 1. **Evaluate** - For each skill in `<available_skills>`, assess: `[skill-name] - YES/NO - [reason]`
 2. **Activate** - Call `Skill(skill-name)` for each relevant skill before proceeding
-3. **Implement** - Begin work only after activation is complete
+3. **Respond** - Begin response only after activation is complete
 
-*Verify:* Did you check available skills before starting implementation?
+**Applies to all tasks** - Research, explanation, code changes, debugging, review — no exceptions
+
+**Decision-point re-evaluation** - Re-evaluate skills at each planning or delegation step:
+- Before entering plan mode
+- Before launching subagents (Task tool)
+- Before starting each task in a task list
+- When the domain shifts mid-task (e.g., from code to evaluation, from schema to grading)
+
+*Verify:* Every Task tool call and plan mode entry was preceded by skill evaluation
 *Fix:* Pause, evaluate skills, activate relevant ones, then continue
 
 **Example:**
@@ -21,6 +29,6 @@
 > Skill(documentation)
 ```
 
-**Activation before implementation** - Evaluating skills without calling `Skill()` provides no benefit
+**Activation before action** - Evaluating skills without calling `Skill()` provides no benefit
 *Verify:* Check that `Skill()` was called for each YES evaluation
 *Fix:* Call `Skill(skill-name)` for skipped activations