feat: bridge_self bot commands — status, thresholds, reset, health

Adds bot commands for the bridge_self provider so operators can inspect
and manage bridge health from chat: /status, /thresholds, /reset, /health.
Includes Jinja2 templates for both locales, seed data, capability slots,
and a handler that exposes pending deferred backlog plus per-counter
reset. Also adds .claude/skills/ for project-scoped graph-aware skills.

.claude/skills/review-changes.md

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+---
+name: Review Changes
+description: Perform a structured code review using change detection and impact
+---
+
+## Review Changes
+
+Perform a thorough, risk-aware code review using the knowledge graph.
+
+### Steps
+
+1. Run `detect_changes` to get risk-scored change analysis.
+2. Run `get_affected_flows` to find impacted execution paths.
+3. For each high-risk function, run `query_graph` with pattern="tests_for" to check test coverage.
+4. Run `get_impact_radius` to understand the blast radius.
+5. For any untested changes, suggest specific test cases.
+
+### Output Format
+
+Provide findings grouped by risk level (high/medium/low) with:
+- What changed and why it matters
+- Test coverage status
+- Suggested improvements
+- Overall merge recommendation
+
+## Token Efficiency Rules
+- ALWAYS start with `get_minimal_context(task="<your task>")` before any other graph tool.
+- Use `detail_level="minimal"` on all calls. Only escalate to "standard" when minimal is insufficient.
+- Target: complete any review/debug/refactor task in ≤5 tool calls and ≤800 total output tokens.