fix: use parent project name for worktree observation writes (#1820)

* fix: use parent project name for worktree observation writes (#1819)

Observations and sessions from git worktrees were stored under
basename(cwd) instead of the parent repo name because write paths
called getProjectName() (not worktree-aware) instead of
getProjectContext() (worktree-aware). This is the same bug as
#1081, #1317, and #1500 — it regressed because the two functions
coexist and new code reached for the simpler one.

Fix: getProjectContext() now returns parentProjectName as primary
when in a worktree, and all four write-path call sites now use
getProjectContext().primary instead of getProjectName().

Includes regression test that creates a real worktree directory
structure and asserts primary === parentProjectName.

* fix: address review nitpicks — allProjects fallback, JSDoc, write-path test

- ContextBuilder: default projects to context.allProjects for legacy
  worktree-labeled record compatibility
- ProjectContext: clarify JSDoc that primary is canonical (parent repo
  in worktrees)
- Tests: add write-path regression test mirroring session-init/SessionRoutes
  pattern; refactor worktree fixture into beforeAll/afterAll

* refactor(project-name): rename local to cwdProjectName and dedupe allProjects

Addresses final CodeRabbit nitpick: disambiguates the local variable
from the returned `primary` field, and dedupes allProjects via Set
in case parent and cwd resolve to the same name.

---------

Co-authored-by: Ethan Hurst <ethan.hurst@outlook.com.au>

src/services/context/ContextBuilder.ts

@@ -10,7 +10,7 @@ import { homedir } from 'os';
 import { unlinkSync } from 'fs';
 import { SessionStore } from '../sqlite/SessionStore.js';
 import { logger } from '../../utils/logger.js';
-import { getProjectName } from '../../utils/project-name.js';
+import { getProjectContext } from '../../utils/project-name.js';
 
 import type { ContextInput, ContextConfig, Observation, SessionSummary } from './types.js';
 import { loadContextConfig } from './ContextConfigLoader.js';
@@ -129,11 +129,12 @@ export async function generateContext(
 ): Promise<string> {
   const config = loadContextConfig();
   const cwd = input?.cwd ?? process.cwd();
-  const project = getProjectName(cwd);
+  const context = getProjectContext(cwd);
+  const project = context.primary;
   const platformSource = input?.platform_source;
 
-  // Use provided projects array (for worktree support) or fall back to single project
-  const projects = input?.projects || [project];
+  // Use provided projects array (for worktree support) or fall back to all known projects
+  const projects = input?.projects ?? context.allProjects;
 
   // Full mode: fetch all observations but keep normal rendering (level 1 summaries)
   if (input?.full) {

src/services/transcripts/processor.ts

@@ -4,7 +4,7 @@ import { fileEditHandler } from '../../cli/handlers/file-edit.js';
 import { sessionCompleteHandler } from '../../cli/handlers/session-complete.js';
 import { ensureWorkerRunning, workerHttpRequest } from '../../shared/worker-utils.js';
 import { logger } from '../../utils/logger.js';
-import { getProjectContext, getProjectName } from '../../utils/project-name.js';
+import { getProjectContext } from '../../utils/project-name.js';
 import { writeAgentsMd } from '../../utils/agents-md-utils.js';
 import { resolveFieldSpec, resolveFields, matchesRule } from './field-utils.js';
 import { expandHomePath } from './config.js';
@@ -104,7 +104,7 @@ export class TranscriptEventProcessor {
     const resolved = resolveFieldSpec(fieldSpec, entry, ctx);
     if (typeof resolved === 'string' && resolved.trim()) return resolved;
     if (watch.project) return watch.project;
-    if (session.cwd) return getProjectName(session.cwd);
+    if (session.cwd) return getProjectContext(session.cwd).primary;
     return session.project;
   }
 

src/services/worker/http/routes/SessionRoutes.ts

@@ -22,7 +22,7 @@ import { PrivacyCheckValidator } from '../../validation/PrivacyCheckValidator.js
 import { SettingsDefaultsManager } from '../../../../shared/SettingsDefaultsManager.js';
 import { USER_SETTINGS_PATH } from '../../../../shared/paths.js';
 import { getProcessBySession, ensureProcessExit } from '../../ProcessRegistry.js';
-import { getProjectName } from '../../../../utils/project-name.js';
+import { getProjectContext } from '../../../../utils/project-name.js';
 import { normalizePlatformSource } from '../../../../shared/platform-source.js';
 
 export class SessionRoutes extends BaseRouteHandler {
@@ -507,7 +507,7 @@ export class SessionRoutes extends BaseRouteHandler {
   private handleObservationsByClaudeId = this.wrapHandler((req: Request, res: Response): void => {
     const { contentSessionId, tool_name, tool_input, tool_response, cwd } = req.body;
     const platformSource = normalizePlatformSource(req.body.platformSource);
-    const project = typeof cwd === 'string' && cwd.trim() ? getProjectName(cwd) : '';
+    const project = typeof cwd === 'string' && cwd.trim() ? getProjectContext(cwd).primary : '';
 
     if (!contentSessionId) {
       return this.badRequest(res, 'Missing contentSessionId');