fix(transcript-store): filter startup splash/header lines from cleaned view

TranscriptStore's cleaned transcript view already handled 3 of 4
PM noise classes (orphan cursor fragments, status overlays,
spinner/chrome/TUI). Startup splash/header lines survived cleanup.

Add isStartupSplashLine() filter for:
- Claude Code version headers ("Claude Code v2.1.101")
- Claude model/plan lines ("Opus 4.6 (Claude Max)")
- Codex version headers ("OpenAI Codex (v0.120.0)"), including
  box-drawing-wrapped variants from Codex's TUI banner

Pattern uses ^ anchoring so legitimate sentences mentioning these
strings ("I was running Claude Code v2.1.101 when...") survive.
Box-drawing chars stripped before matching to handle Codex's
bordered startup banner.

Conservative scope per QA directive: does NOT filter generic
"model:" or "directory:" lines that could be legitimate command
output. Only filters clearly-branded startup header patterns.

Tests added (2): startup splash lines removed from both runtimes
+ preservation of legitimate sentences mentioning splash strings.

Product recommendation: rig transcript stays cleaned-by-default;
--raw/--clean split deferred unless forensic workflows request it.

Gates: transcript-store 32/32 (+2); full daemon 1801/1801;
tsc + build clean.

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

packages/daemon/src/domain/transcript-store.ts

@@ -69,6 +69,19 @@ function stripOrphanCursorFragments(line: string): string {
   return line.replace(/\[\d{1,3}[A-Za-z](?=\S)/g, " ");
 }
 
+function isStartupSplashLine(line: string): boolean {
+  // Strip box-drawing wrappers from Codex-style banners before matching
+  const stripped = line.replace(/[│╭╰╮╯─━]/g, "").trim();
+  if (!stripped) return false;
+  // Claude Code version header: "Claude Code v2.1.101"
+  if (/^Claude Code v[\d.]+/.test(stripped)) return true;
+  // Claude model/plan line: "Opus 4.6 (Claude Max)", "Sonnet 4.6 (1M context)"
+  if (/^(?:Opus|Sonnet|Haiku) \d[\d.]+ /.test(stripped)) return true;
+  // Codex version header: "OpenAI Codex (v0.120.0)", ">_ OpenAI Codex (v0.120.0)"
+  if (/^>?_?\s*(?:OpenAI )?Codex\b.*v[\d.]+/.test(stripped)) return true;
+  return false;
+}
+
 function isStatusOverlayLine(line: string): boolean {
   const trimmed = line.trim();
   if (!trimmed) return false;
@@ -248,6 +261,7 @@ export class TranscriptStore {
       .filter((line) => line.trim() !== "")
       .filter((line) => !isBareShellPrompt(line));
     return filtered
+      .filter((line) => !isStartupSplashLine(line))
       .filter((line) => !isStatusOverlayLine(line))
       .filter((line) => !isUiChromeLine(line))
       .filter((line) => !isSpinnerOnlyLine(line))

packages/daemon/test/transcript-store.test.ts

@@ -333,6 +333,55 @@ describe("TranscriptStore", () => {
       expect(result).toContain("We were discussing the gpt-5.4 xhigh fast footer format yesterday.");
     });
 
+    it("drops startup splash/header lines from Claude Code and Codex sessions", () => {
+      const store = new TranscriptStore({ transcriptsRoot: tmpDir });
+      store.ensureTranscriptDir("my-rig");
+      const filePath = store.getTranscriptPath("my-rig", "dev@my-rig");
+      writeFileSync(
+        filePath,
+        [
+          "Claude Code v2.1.101",
+          "Opus 4.6 (Claude Max)",
+          "╭───────────────────────────────────────╮",
+          "│ >_ OpenAI Codex (v0.120.0)            │",
+          "│                                       │",
+          "│ model:     gpt-5.4   /model to change │",
+          "│ directory: ~/code/openrig             │",
+          "╰───────────────────────────────────────╯",
+          "real semantic transcript content should survive",
+          "and this line too",
+        ].join("\n") + "\n",
+      );
+
+      const result = store.readTail("my-rig", "dev@my-rig", 20);
+
+      expect(result).toContain("real semantic transcript content should survive");
+      expect(result).toContain("and this line too");
+      expect(result).not.toContain("Claude Code v2.1.101");
+      expect(result).not.toContain("Opus 4.6");
+      expect(result).not.toContain("OpenAI Codex");
+    });
+
+    it("preserves legitimate sentences that mention startup splash strings", () => {
+      const store = new TranscriptStore({ transcriptsRoot: tmpDir });
+      store.ensureTranscriptDir("my-rig");
+      const filePath = store.getTranscriptPath("my-rig", "dev@my-rig");
+      writeFileSync(
+        filePath,
+        [
+          "I was running Claude Code v2.1.101 when the bug appeared.",
+          "The Opus 4.6 model performed well on the benchmark.",
+          "We tested against OpenAI Codex (v0.120.0) for comparison.",
+        ].join("\n") + "\n",
+      );
+
+      const result = store.readTail("my-rig", "dev@my-rig", 20);
+
+      expect(result).toContain("I was running Claude Code v2.1.101 when the bug appeared.");
+      expect(result).toContain("The Opus 4.6 model performed well on the benchmark.");
+      expect(result).toContain("We tested against OpenAI Codex (v0.120.0) for comparison.");
+    });
+
     it("preserves literal cursor-fragment tokens when they are mentioned as data", () => {
       const store = new TranscriptStore({ transcriptsRoot: tmpDir });
       store.ensureTranscriptDir("my-rig");