fix(sync): skip Python venv/ in the code walker

collectSyncableFiles (first-sync walker) and the incremental PRUNE_DIR_NAMES
set skipped node_modules but not Python venv/. On a Python repo the walker
descended into venv/ (thousands of files); the resulting slug collisions
crashed putPage's INSERT ... ON CONFLICT ... RETURNING with
"undefined is not an object (evaluating 'row.deleted_at')".

Add `venv` alongside node_modules in both the import.ts inline skip and
PRUNE_DIR_NAMES. venv is the Python equivalent of node_modules.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/commands/import.ts

@@ -548,7 +548,10 @@ export function collectSyncableFiles(dir: string, opts: CollectOpts = {}): strin
       // Same set the legacy walkers honored, surfaced once at the top of
       // every iteration.
       if (entry.startsWith('.')) continue;
-      if (entry === 'node_modules' || entry === 'ops') continue;
+      // `venv` is the Python equivalent of `node_modules`: a vendored
+      // dependency tree (often thousands of files) that floods the slug
+      // namespace and triggers ON CONFLICT collisions on first full sync.
+      if (entry === 'node_modules' || entry === 'ops' || entry === 'venv') continue;
 
       const full = join(d, entry);
       let stat;

src/core/sync.ts

@@ -241,6 +241,11 @@ function matchesAnyGlob(path: string, patterns?: string[]): boolean {
  */
 const PRUNE_DIR_NAMES = new Set<string>([
   'node_modules',
+  // Python venv: vendored dependency tree, the `node_modules` analogue.
+  // Like `node_modules` it lacks a leading dot so isSyncable's dot-prefix
+  // exclusion misses it; explicit entry keeps incremental sync consistent
+  // with the first-sync walker in commands/import.ts.
+  'venv',
   '.raw',
   'ops',
 ]);