[P2][lens] Block doc() on cataloged relational tables

[cevheri]

Summary

doc(store, name) on a name already cataloged as a relational table bypasses schema validation. Rows written via doc() can violate the table schema; LibreDB Studio and catalog "faithful view" break.

Audit ID: Section 2 Med — Wave 2

Root cause

doc() calls assertUserName(collection) but does not check catalog kind. Relational tables register via recordRelational() in catalog.ts.

Fix

In doc() (after assertUserName), if catalog has kind === "relational" for name → throw:

libredb: "${name}" is a relational table; use table() instead of doc()

Mirror inverse guard on table() if missing.

Tests

• Create table → doc(db, sameName) throws.
• Uncataloged collection still works.

Acceptance criteria

• Cataloged relational names blocked from doc().
• Clear error message.
• bun run gate green.
• Changeset required.

Verification

bun run gate

[cevheri]

Implemented and shipped in PR #43 (merge commit 69f7161), released as v0.2.0. The PR description's comma-separated Closes list only auto-closed the first reference — closing manually. For #39/#28-style partials: the shipped scope is done; the real-browser verification half of #39 continues under #10, and the typed-error contract (#28) shipped as LibreDbError with stable codes across kernel, adapters, lenses, and CLI.