Add Schema Followups

The add-schema-validation-coverage change (committed as a3e1c8a) wired schema validation into eleven connectors and surfaced three followups it explicitly did not address:

The polyfill-connectors package SHALL provide a pure-function reconciler (reconcile, parseManifestStreams, parseSchemaStreams, scanEmittedStreams, and reconcileFromDisk in src/manifest-reconcile.ts) that compares declared streams (manifest), registered streams (schema registry keys), and emit-site stream-name literals (static-scanned from connector source).

Every connector enrolled in pilot-fixture coverage SHALL ship: 1. A fixtures/<connector>/scrubbed/pilot-real-shape/records/<stream>.jsonl file for each stream in SCHEMAS, containing 1+ synthetic-but-shape-real record(s) that pass validateRecord(stream, record). 2. A connectors/<connector>/pilot-fixture.test.ts that registers per-stream replay tests via src/pilot-fixture-test-helper.ts.