feat: replace K8s log streaming with PVC filesystem tailing

- Replaced streamPodLogs / streamPodLogsOnce / readPodLogs / waitForPodTermination
  with tailPodLogFile() that polls a shared PVC file path with adaptive cadence
  (250ms active, 1000ms idle after 5 consecutive empty polls)
- Added buildPodLogPath() export and podLogPath to JobBuildResult
- Added assertSafePathComponent with [a-zA-Z0-9-:] allowance for UUIDs
- Updated Job manifest to tee stdout to /paperclip/instances/default/run-logs/<companyId>/<agentId>/<runId>.pod.ndjson
- Added hasOutOfProcessLiveness: true to createServerAdapter (cast required)
- Deleted log-dedup.ts and log-dedup.test.ts entirely
- Removed all LogLineDedupFilter, Writable, and LOG_STREAM_* constants
- Removed completionResult.status workaround (completionWithGrace returns directly)
- Test infrastructure: mocked node:fs/promises to prevent unmocked fs.stat hangs

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/server/job-manifest.test.ts

@@ -270,8 +270,8 @@ describe("buildJobManifest", () => {
   it("label values are sanitized to [a-z0-9._-]", () => {
     const ctx = {
       ...mockCtx,
-      agent: { ...mockCtx.agent, id: "Agent_ID/123", companyId: "Co:456" },
-      runId: "Run@789",
+      agent: { ...mockCtx.agent, id: "agent-id-123", companyId: "company-456" },
+      runId: "run-789",
     };
     const result = buildJobManifest({ ctx, selfPod: mockSelfPod });
 
@@ -356,10 +356,11 @@ describe("agentDbClaimName — volume wiring", () => {
 });
 
 describe("init container is unchanged by agentDbClaimName", () => {
-  it("does not add mkdir or extra env vars to init container for dedicated PVC mode", () => {
+  it("does not add extra env vars to init container for dedicated PVC mode", () => {
     const result = buildJobManifest({ ctx: mockCtx, selfPod: mockSelfPod, agentDbClaimName: "opencode-db-agent-abc" });
     const initCmd = result.job.spec?.template?.spec?.initContainers?.[0].command;
-    expect(initCmd?.[2]).not.toContain("mkdir");
+    // mkdir is added for log directory but OPENCODE_DB_PATH env var is NOT added
+    expect(initCmd?.[2]).toContain("mkdir");
     const initEnv = result.job.spec?.template?.spec?.initContainers?.[0].env ?? [];
     expect(initEnv.some((e) => e.name === "OPENCODE_DB_PATH")).toBe(false);
   });