phase 4: hermes agent — MCP tools, activity logging, 'all' role, wiring fixes

- mcp/server.go: 7 new tools (get_signal_history, get_patterns, get_skills,
  request_execution, get_trend, get_event_timeline, get_agent_activity),
  agent_activity logging middleware on every tool call.
- phase3.go: QueryAgentActivity REST handler implemented (was stub).
  Fixed scan count mismatch in ListSkills/PatchSkill/ListSkillVersions
  (13 cols → 12 targets). Fixed AgentActivity cursor pagination
  (lexicographic → integer comparison). Fixed s.Slug → s.Name in log.
- cmd/oikos/main.go: 'all' role now runs api + scheduler + notifier in
  one process. Replaced nil SchedulerRunner/NotifierRunner with direct
  scheduler.RunnerForMain() / notifier.RunnerForMain() imports.
  Added runWithPool helper for standalone scheduler/notifier roles.
- internal/config/config.go: added HermesAgentID env var.
- internal/httpapi/server.go: pass HermesAgentID to MCP handler.
- docker-compose.yml: added scheduler and notifier services (dev profile).
- hermes/: config.yaml, SOUL.md, skills/homelab-ops/SKILL.md.
- Cleaned up: scheduler/init.go dead code, mcp/server.go pgx import guard.

internal/mcp/server_test.go

@@ -2,6 +2,8 @@ package mcp
 
 import (
 	"testing"
+
+	"github.com/google/uuid"
 )
 
 // TestNewServerRegistersTools verifies every tool registers with a valid
@@ -16,7 +18,7 @@ func TestNewServerRegistersTools(t *testing.T) {
 	}()
 	// pool is only used inside tool handlers (invoked per-call), not at
 	// registration time, so a nil pool is safe for this construction test.
-	s := newServer(nil)
+	s := newServer(nil, uuid.Nil)
 	if s == nil {
 		t.Fatal("newServer returned nil")
 	}