feat(stdlib): Sqlite schema introspection + bulk I/O + error inspection — db-theory #1c (6 externs)

[hyperpolymath]

Summary

Closes out the SQLite stdlib triad (#522 foundation + #524 prepared statements + this PR). Adds the three remaining practical surfaces:

layer	externs
Schema introspection	db_schema_tables(d), db_schema_columns(d, table), db_table_exists(d, table)
Bulk CSV I/O	db_import_csv(d, table, path, has_header), db_export_csv(d, sql, params, path)
Error inspection	db_last_error(d) (typed DbError carrier lands in #1d)

Codegen + adapter

6 b "name" registrations + 6 __as_db* JS helpers, each delegating to one new method on globalThis.__as_sqlite (schemaTables, schemaColumns, tableExists, importCsv, exportCsv, lastError). Real adapters back these with one-line wrappers (PRAGMA table_info, prepare().iterate(), fs writes).

Smoke harness (tests/codegen-deno/sqlite_introspect_bulk.{affine,harness.mjs})

8 smoke functions × 9 assertions — schema_tables ordering, column descriptor shape (incl. PK flag), table_exists true/false, CSV import skipping header, CSV export including header, last_error empty/fault-injected. Mock extends the #1a/#1b adapter with the 6 new methods plus a virtual filesystem map for hermetic CSV testing.

Verification

• dune build: clean
• dune runtest: 363 / 363 green
• tools/run_codegen_deno_tests.sh: 33 / 33 harnesses pass (was 32)

Stacked on #524

#524 (db-theory #1b — prepared statements) MERGED 13:15Z. This branch forks from its head and rebases cleanly.

db-theory #1d (next PR, separate)

• extern type DbError opaque carrier
• Result<T, DbError>-shaped variants of the convenience surface
• Design-blocked on the wider error-model question (do we add Result returns to all extern fns or keep the JSON-string sentinel pattern?)

Test plan

• dune build clean
• dune runtest 363/363 green
• 33/33 codegen-deno harnesses pass
• 9 introspection/bulk/error smoke assertions pass

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 88 issues detected

Severity	Count
🔴 Critical	2
🟠 High	16
🟡 Medium	70

⚠️ Action Required: Critical security issues found!

View findings

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