feat(#164): Add database schema for job tracking

Add Prisma schema for runner jobs, job steps, and job events to support
the autonomous runner infrastructure (M4.2).

Enums added:
- RunnerJobStatus: PENDING, QUEUED, RUNNING, COMPLETED, FAILED, CANCELLED
- JobStepPhase: SETUP, EXECUTION, VALIDATION, CLEANUP
- JobStepType: COMMAND, AI_ACTION, GATE, ARTIFACT
- JobStepStatus: PENDING, RUNNING, COMPLETED, FAILED, SKIPPED

Models added:
- RunnerJob: Top-level job tracking linked to workspace and agent_tasks
- JobStep: Granular step tracking within jobs with phase organization
- JobEvent: Immutable event sourcing audit log for jobs and steps

Foreign key relationships:
- runner_jobs → workspaces (workspace_id, CASCADE)
- runner_jobs → agent_tasks (agent_task_id, SET NULL)
- job_steps → runner_jobs (job_id, CASCADE)
- job_events → runner_jobs (job_id, CASCADE)
- job_events → job_steps (step_id, CASCADE)

Indexes added for performance on workspace_id, status, priority, timestamp.

Migration: 20260201205935_add_job_tracking

Quality gates passed: typecheck, lint, build

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/api/prisma/migrations/20260201205935_add_job_tracking/migration.sql

@@ -0,0 +1,112 @@
+-- CreateEnum
+CREATE TYPE "RunnerJobStatus" AS ENUM ('PENDING', 'QUEUED', 'RUNNING', 'COMPLETED', 'FAILED', 'CANCELLED');
+
+-- CreateEnum
+CREATE TYPE "JobStepPhase" AS ENUM ('SETUP', 'EXECUTION', 'VALIDATION', 'CLEANUP');
+
+-- CreateEnum
+CREATE TYPE "JobStepType" AS ENUM ('COMMAND', 'AI_ACTION', 'GATE', 'ARTIFACT');
+
+-- CreateEnum
+CREATE TYPE "JobStepStatus" AS ENUM ('PENDING', 'RUNNING', 'COMPLETED', 'FAILED', 'SKIPPED');
+
+-- CreateTable
+CREATE TABLE "runner_jobs" (
+    "id" UUID NOT NULL,
+    "workspace_id" UUID NOT NULL,
+    "agent_task_id" UUID,
+    "type" TEXT NOT NULL,
+    "status" "RunnerJobStatus" NOT NULL DEFAULT 'PENDING',
+    "priority" INTEGER NOT NULL,
+    "progress_percent" INTEGER NOT NULL DEFAULT 0,
+    "result" JSONB,
+    "error" TEXT,
+    "created_at" TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "started_at" TIMESTAMPTZ,
+    "completed_at" TIMESTAMPTZ,
+
+    CONSTRAINT "runner_jobs_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "job_steps" (
+    "id" UUID NOT NULL,
+    "job_id" UUID NOT NULL,
+    "ordinal" INTEGER NOT NULL,
+    "phase" "JobStepPhase" NOT NULL,
+    "name" TEXT NOT NULL,
+    "type" "JobStepType" NOT NULL,
+    "status" "JobStepStatus" NOT NULL DEFAULT 'PENDING',
+    "output" TEXT,
+    "tokens_input" INTEGER,
+    "tokens_output" INTEGER,
+    "started_at" TIMESTAMPTZ,
+    "completed_at" TIMESTAMPTZ,
+    "duration_ms" INTEGER,
+
+    CONSTRAINT "job_steps_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateTable
+CREATE TABLE "job_events" (
+    "id" UUID NOT NULL,
+    "job_id" UUID NOT NULL,
+    "step_id" UUID,
+    "type" TEXT NOT NULL,
+    "timestamp" TIMESTAMPTZ NOT NULL,
+    "actor" TEXT NOT NULL,
+    "payload" JSONB NOT NULL,
+
+    CONSTRAINT "job_events_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "runner_jobs_id_workspace_id_key" ON "runner_jobs"("id", "workspace_id");
+
+-- CreateIndex
+CREATE INDEX "runner_jobs_workspace_id_idx" ON "runner_jobs"("workspace_id");
+
+-- CreateIndex
+CREATE INDEX "runner_jobs_workspace_id_status_idx" ON "runner_jobs"("workspace_id", "status");
+
+-- CreateIndex
+CREATE INDEX "runner_jobs_agent_task_id_idx" ON "runner_jobs"("agent_task_id");
+
+-- CreateIndex
+CREATE INDEX "runner_jobs_priority_idx" ON "runner_jobs"("priority");
+
+-- CreateIndex
+CREATE INDEX "job_steps_job_id_idx" ON "job_steps"("job_id");
+
+-- CreateIndex
+CREATE INDEX "job_steps_job_id_ordinal_idx" ON "job_steps"("job_id", "ordinal");
+
+-- CreateIndex
+CREATE INDEX "job_steps_status_idx" ON "job_steps"("status");
+
+-- CreateIndex
+CREATE INDEX "job_events_job_id_idx" ON "job_events"("job_id");
+
+-- CreateIndex
+CREATE INDEX "job_events_step_id_idx" ON "job_events"("step_id");
+
+-- CreateIndex
+CREATE INDEX "job_events_timestamp_idx" ON "job_events"("timestamp");
+
+-- CreateIndex
+CREATE INDEX "job_events_type_idx" ON "job_events"("type");
+
+-- AddForeignKey
+ALTER TABLE "runner_jobs" ADD CONSTRAINT "runner_jobs_workspace_id_fkey" FOREIGN KEY ("workspace_id") REFERENCES "workspaces"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "runner_jobs" ADD CONSTRAINT "runner_jobs_agent_task_id_fkey" FOREIGN KEY ("agent_task_id") REFERENCES "agent_tasks"("id") ON DELETE SET NULL ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "job_steps" ADD CONSTRAINT "job_steps_job_id_fkey" FOREIGN KEY ("job_id") REFERENCES "runner_jobs"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "job_events" ADD CONSTRAINT "job_events_job_id_fkey" FOREIGN KEY ("job_id") REFERENCES "runner_jobs"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE "job_events" ADD CONSTRAINT "job_events_step_id_fkey" FOREIGN KEY ("step_id") REFERENCES "job_steps"("id") ON DELETE CASCADE ON UPDATE CASCADE;