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/scheduler/init.go

@@ -2,28 +2,12 @@ package scheduler
 
 import (
 	"context"
-	"log/slog"
 
 	"github.com/dtoro/oikos/internal/config"
 	"github.com/dtoro/oikos/internal/db"
-	"github.com/dtoro/oikos/internal/db/sqlcgen"
 )
 
-func init() {
-	// Register with main package via package-level variable
-	// The cmd/oikos/main.go sets SchedulerRunner in its import
-	mainRunner = Run
-}
-
-// mainRunner is assigned to main.SchedulerRunner by the cmd/oikos package.
-// It's set during init so that when main runs, the scheduler Runner is available.
-var mainRunner func(context.Context, *db.Pool, config.Config)
-
 // RunnerForMain provides the run function for registration in main.
 func RunnerForMain() func(context.Context, *db.Pool, config.Config) {
 	return Run
 }
-
-// ensure sqlcgen is used
-var _ = sqlcgen.Queries{}
-var _ = slog.Default