feat(mcp): implement extended RFC services + transport (#842)
Additive-only — no existing files modified.
Services (php/Mcp/Services/):
- CircuitBreaker (3-state, Cache::add trial lock)
- DataRedactor (28 sensitive + 16 PII keys, partial-redact algorithm)
- McpHealthService (YAML registry + JSON-RPC stdio ping protocolVersion 2024-11-05)
- McpMetricsService (p50/p95/p99 linear interpolation)
- McpWebhookDispatcher (mcp.tool.executed → WebhookEndpoints)
- OpenApiGenerator (OpenAPI 3.0.3)
- ToolRateLimiter (Cache::put first, Cache::increment after — no reset)
- AgentSessionService (php/Mod/Mcp/Services/ namespace per spec)
Transport (php/Mcp/Transport/):
- McpContext (transport-agnostic callbacks)
- Contracts/McpToolHandler interface
Resources (php/Mcp/Resources/):
- AppConfig, ContentResource, DatabaseSchema
Config: php/resources/mcp/registry.yaml.
Pest Feature tests _Good/_Bad/_Ugly per AX-10 for each new class.
Co-authored-by: Codex <noreply@openai.com>
Closes tasks.lthn.sh/view.php?id=842
91551dec9b