fix: ralph tracker — 3 bugs: first-occurrence completion, double-counting, TodoWrite pattern

Bug 1 (CRITICAL): canonicalCount >= 1 always fired on first <promise> tag
(prompt echo). Changed to >= 2 so only 2nd+ occurrence triggers completion.

Bug 2: checkMultiLinePatterns() re-detected complete tags already handled
by processLine(), double-counting. Now only tries completion when partial
buffer is non-empty (cross-chunk scenario).

Bug 3: TodoWrite ✔ patterns required "Task #N" but real Claude Code output
is plain "✔ content". Added TODO_PLAIN_CHECKMARK_PATTERN fallback.

Includes 71 new deep tests + real-life verification.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

test/respawn-controller.test.ts

@@ -95,7 +95,7 @@ describe('RespawnController', () => {
     it('should have default configuration', () => {
       const config = controller.getConfig();
       expect(config.enabled).toBe(true);
-      expect(config.updatePrompt).toBe('update all the docs and CLAUDE.md');
+      expect(config.updatePrompt).toBe('write a brief progress summary to CLAUDE.md noting what you accomplished, then continue working.');
     });
 
     it('should allow custom configuration', () => {
@@ -216,7 +216,7 @@ describe('RespawnController', () => {
 
       expect(stepSent).toBe('update');
       expect(session.writeBuffer.length).toBeGreaterThan(0);
-      expect(session.writeBuffer[0]).toContain('update all the docs');
+      expect(session.writeBuffer[0]).toContain('write a brief progress summary');
     });
 
     it('should transition through states during cycle', async () => {