feat: MCP tool completeness — expose all REST endpoints as MCP tools — Issue #441

[OneStepAt4time]

Summary

Fixes #441. M1.1 milestone.

Before: 5 MCP tools (list, get, transcript, send, create)
After: 21 MCP tools — full REST API coverage

P0 (session lifecycle)

• kill_session — DELETE /v1/sessions/:id
• approve_permission — POST /v1/sessions/:id/approve
• reject_permission — POST /v1/sessions/:id/reject
• server_health — GET /v1/health

P1 (session interaction)

• send_bash — POST /v1/sessions/:id/bash
• send_command — POST /v1/sessions/:id/command
• escape_session — POST /v1/sessions/:id/escape
• interrupt_session — POST /v1/sessions/:id/interrupt
• capture_pane — GET /v1/sessions/:id/pane

P2 (advanced)

• get_session_metrics — GET /v1/sessions/:id/metrics
• get_session_latency — GET /v1/sessions/:id/latency
• get_session_summary — GET /v1/sessions/:id/summary
• batch_create_sessions — POST /v1/sessions/batch
• list_pipelines — GET /v1/pipelines
• create_pipeline — POST /v1/pipelines
• get_swarm — GET /v1/swarm

Changes

• src/mcp-server.ts: VERSION 2.0.0, 16 new AegisClient methods, 16 new MCP tools
• src/tests/mcp-server.test.ts: 34 tests (up from 12)

Test plan

• tsc --noEmit — clean
• npm run build — clean
• npm test — 1449 tests passing (64 files)
• All 21 tool registrations tested