feat: add runtime context awareness — system.info tool + date/time in system prompt

- assembleSystemPrompt() now injects '# Runtime Context' with current date/time
- New system.info tool: date, time, hostname, platform, arch, uptime, memory, Node.js version
- Tool available in all profiles (minimal/messaging/coding/full)
- 983 tests passing (+7 new)

src/prompt/template.test.ts

@@ -24,7 +24,7 @@ describe('assembleSystemPrompt', () => {
     const dir = makeTempDir();
     const result = assembleSystemPrompt({ searchDirs: [dir] });
 
-    expect(result.prompt).toBe(
+    expect(result.prompt).toContain(
       'You are Flynn, a helpful personal AI assistant. Be direct, concise, and helpful. Use markdown when it improves readability.',
     );
     expect(result.loadedFiles).toEqual([]);
@@ -36,7 +36,7 @@ describe('assembleSystemPrompt', () => {
 
     const result = assembleSystemPrompt({ searchDirs: [dir] });
 
-    expect(result.prompt).toBe('You are Flynn.');
+    expect(result.prompt).toContain('You are Flynn.');
     expect(result.loadedFiles).toHaveLength(1);
     expect(result.loadedFiles[0]).toContain('SOUL.md');
   });
@@ -47,7 +47,7 @@ describe('assembleSystemPrompt', () => {
 
     const result = assembleSystemPrompt({ searchDirs: [dir] });
 
-    expect(result.prompt).toBe('# Agent Instructions\n\nFollow these rules.');
+    expect(result.prompt).toContain('# Agent Instructions\n\nFollow these rules.');
     expect(result.loadedFiles).toHaveLength(1);
     expect(result.loadedFiles[0]).toContain('AGENTS.md');
   });
@@ -62,7 +62,7 @@ describe('assembleSystemPrompt', () => {
 
     expect(result.loadedFiles).toHaveLength(3);
     // Verify correct ordering: SOUL → AGENTS → USER
-    expect(result.prompt).toBe(
+    expect(result.prompt).toContain(
       'I am Flynn.\n\n# Agent Instructions\n\nBe helpful.\n\n# User Context\n\nUser likes cats.',
     );
   });
@@ -75,7 +75,7 @@ describe('assembleSystemPrompt', () => {
 
     const result = assembleSystemPrompt({ searchDirs: [dir1, dir2] });
 
-    expect(result.prompt).toBe('Primary identity.');
+    expect(result.prompt).toContain('Primary identity.');
     expect(result.loadedFiles).toHaveLength(1);
     expect(result.loadedFiles[0]).toContain(dir1);
   });
@@ -87,7 +87,7 @@ describe('assembleSystemPrompt', () => {
 
     const result = assembleSystemPrompt({ searchDirs: [dir1, dir2] });
 
-    expect(result.prompt).toBe('Fallback identity.');
+    expect(result.prompt).toContain('Fallback identity.');
     expect(result.loadedFiles[0]).toContain(dir2);
   });
 
@@ -102,7 +102,7 @@ describe('assembleSystemPrompt', () => {
       ],
     });
 
-    expect(result.prompt).toBe(
+    expect(result.prompt).toContain(
       'Base identity.\n\n# Custom Rules\n\nAlways be polite.',
     );
   });
@@ -114,7 +114,7 @@ describe('assembleSystemPrompt', () => {
 
     const result = assembleSystemPrompt({ searchDirs: [dir] });
 
-    expect(result.prompt).toBe(
+    expect(result.prompt).toContain(
       'You are Flynn, a helpful personal AI assistant. Be direct, concise, and helpful. Use markdown when it improves readability.',
     );
     expect(result.loadedFiles).toEqual([]);
@@ -132,7 +132,7 @@ describe('assembleSystemPrompt', () => {
       ],
     });
 
-    expect(result.prompt).toBe(
+    expect(result.prompt).toContain(
       'Base identity.\n\n# Populated\n\nHas content.',
     );
   });
@@ -161,7 +161,7 @@ describe('assembleSystemPrompt', () => {
 
     const result = assembleSystemPrompt({ searchDirs: [dir] });
 
-    expect(result.prompt).toBe('I am Flynn.');
+    expect(result.prompt).toContain('I am Flynn.');
   });
 
   it('mixes files from different search directories', () => {
@@ -173,6 +173,15 @@ describe('assembleSystemPrompt', () => {
     const result = assembleSystemPrompt({ searchDirs: [dir1, dir2] });
 
     expect(result.loadedFiles).toHaveLength(2);
-    expect(result.prompt).toBe('Primary soul.\n\n# Agent Instructions\n\nAgent rules.');
+    expect(result.prompt).toContain('Primary soul.\n\n# Agent Instructions\n\nAgent rules.');
+  });
+
+  it('always includes Runtime Context section', () => {
+    const dir = makeTempDir();
+    writeFileSync(join(dir, 'SOUL.md'), 'I am Flynn.');
+    const result = assembleSystemPrompt({ searchDirs: [dir] });
+    expect(result.prompt).toContain('# Runtime Context');
+    expect(result.prompt).toContain('Current date:');
+    expect(result.prompt).toContain('Current time:');
   });
 });

src/prompt/template.ts

@@ -63,10 +63,27 @@ export function assembleSystemPrompt(config: PromptTemplateConfig): PromptTempla
     }
   }
 
-  // Fallback if nothing was loaded
-  if (sections.length === 0) {
+  // Inject current date/time as runtime context
+  const now = new Date();
+  const dateStr = now.toLocaleDateString('en-US', {
+    weekday: 'long',
+    year: 'numeric',
+    month: 'long',
+    day: 'numeric',
+  });
+  const timeStr = now.toLocaleTimeString('en-US', {
+    hour: '2-digit',
+    minute: '2-digit',
+    timeZoneName: 'short',
+    hour12: false,
+  });
+  const runtimeContext = `# Runtime Context\n\nCurrent date: ${dateStr}\nCurrent time: ${timeStr}`;
+  sections.push(runtimeContext);
+
+  // Fallback if only the runtime context was loaded (no actual prompt files)
+  if (sections.length === 1) {
     return {
-      prompt: 'You are Flynn, a helpful personal AI assistant. Be direct, concise, and helpful. Use markdown when it improves readability.',
+      prompt: `You are Flynn, a helpful personal AI assistant. Be direct, concise, and helpful. Use markdown when it improves readability.\n\n${runtimeContext}`,
       loadedFiles: [],
     };
   }