Lab: swamp model type describe fails with 'No such file' instead of rebundling when bundle is missing

Summary

When a user-defined extension's bundle file under .swamp/bundles/<hash>/<name>.js is missing — but the extension catalog (.swamp/_extension_catalog.db) still references it by absolute path — swamp model type describe, swamp model method run, and other type-resolving operations fail with:

No such file or directory (os error 2): readfile '/.../.swamp/bundles/<hash>/<name>.js'

The error originates in UserModelLoader.importBundleByPath (per the trace). swamp does not fall back to a rebundle from source even though the source .ts file is present.

Reproducer

In a swamp repo with a user extension under extensions/models/<name>.ts, run any command that loads the type so the catalog and bundle exist:
```
swamp model type describe @user/<name>
```
Delete the bundle file:
```
rm .swamp/bundles/<hash>/<name>.js
```
Re-run the same command. Expected: swamp detects the missing bundle and rebuilds it from source. Actual: throws No such file or directory (os error 2).

Workaround

Force a full catalog rescan (which also re-bundles):

rm .swamp/_extension_catalog.db .swamp/_extension_catalog.db-shm .swamp/_extension_catalog.db-wal

The next swamp invocation rebuilds the catalog and bundles. (Alternative: rm -rf .swamp/bundles plus the catalog removal — both needed for a clean rebuild.)

Triggers in normal use

Extension version bump that should rebundle but doesn't (the freshness check or upgrade path doesn't always recreate the bundle).
Cleaning .swamp/bundles/ partially during local debugging.
A failed previous bundle attempt leaving the catalog with a stale path entry.

Distinct from but in the same area as docs/learning/swamp-bundle-cache-timestamp.md: the prior > vs >= mtime fallback issue (rebundle attempt fails because deps missing → falls back to cache only when bundleStat.mtime > newestSourceMtime). Today's failure mode is the inverse — the bundle is missing, not stale-mtime — and the loader errors out instead of attempting a rebundle.

Suggested fix

In UserModelLoader.importBundleByPath, when the bundle file is absent, fall through to a rebundle-from-source path (the same code path used on first load) instead of bubbling up the file-not-found error. Alternatively, on every catalog hit, check that the referenced bundle file exists; if not, treat the catalog entry as stale and re-resolve from source.

Environment

swamp 20260424.000956.0-sha.25668e08
macOS Darwin 25.4.0 (Apple Silicon, sandbox not relevant)
Reproduced 2026-05-02 in a real ops repo while bumping a @4chems/keycloak-realm extension version.

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