Add Change Intelligence service integration

[manthan787]

Summary

• Adds an optional integration with the Change Intelligence service — git blame, but for agents
• When enabled, the CLI can surface recent changes during incident triage, correlate changes with affected services, and predict blast radius before changes land
• Disabled by default (providers.changeIntelligence.enabled: false) — zero impact on existing users

What's included

Area	Files	What it does
Adapter	src/providers/change-intelligence/adapter.ts	HTTP client with inlined types — no new dependencies
Config	src/utils/config.ts	providers.changeIntelligence schema (enabled, baseUrl, apiKey)
Agent tools	src/tools/registry.ts	4 tools: query_change_events, correlate_changes, predict_blast_radius, get_change_velocity
Tool gating	src/cli/runtime-tools.ts	Tools hidden unless changeIntelligence.enabled is true
Triage	src/agent/investigation-orchestrator.ts	correlate_changes wired as a triage source
Causal queries	src/agent/causal-query.ts	Change correlation added to deployment_issues pattern
Summarizers	src/agent/tool-summarizer.ts	Summaries for correlation and change event results
Mutation hook	src/integrations/hook-handlers.ts	Detects mutations (deploys, infra changes) in postToolUse and registers them as change events
MCP	src/mcp/server.ts	2 MCP tools: query_changes, predict_change_impact
CLI	src/cli.tsx	runbook changes subcommands: list, register, correlate, blast-radius, velocity

How to enable

# .runbook.yaml
providers:
  changeIntelligence:
    enabled: true
    baseUrl: http://localhost:3001  # default
    # apiKey: optional

Test plan

• npm run typecheck passes
• All 433 existing tests pass — no regressions
• Manual: start change-intelligence service → runbook changes list → verify connectivity
• Manual: runbook changes register -s api-gateway --type deployment --summary "Deploy v2" → verify event stored
• Manual: trigger runbook investigate with change-intelligence enabled → verify correlation appears in triage

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