marcopan eb3bde90e2 test(harness): L0 testcontainers + L1 contract tests for ported db/mschema/rest (A9, spec §1) ...

Ports the leaf data-layer modules and validates them:
- mschema/ (models, eligibility, merge, render), db/ (connection, sampling,
  introspect, fetch_ca), rest/client.py -- renamed psdwp3->nsp, verbatim.
- L0 (testcontainers, real Postgres): db connection read-only enforcement
  (psd_ro cannot CREATE/INSERT), introspect against a known schema (tables,
  columns, types, comments, FKs, enum, composite PK), sampling most-frequent
  values + truncation reporting. 15 tests, ~4s.
- L1 (fake data): rest/client RPC contract (mocked transport -- X-API-Key
  header, payloads, base_url slash handling, HTTP/network error surfacing),
  mschema/render 3 formats (markdown, mschema-text, schema-dict) +
  eligibility rules (wide_text excluded, short_text/numeric/enum/temporal/
  boolean eligible, annotation override wins). 25 tests.

pyproject registers l0/l2 markers + addopts '-m not l2' (L2 opt-in).

Deferred to their dependency-porting tasks: test_rrf.py (search needs
vectorstore, B3) and the 11 CLI contract tests (need _guards/session, wired
when each command lands). 'Not assumed reliable' now has real teeth for the
data layer; CLI/search contracts follow.

2026-06-26 22:53:08 +02:00

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