feat(cli)!: remove fast mode; ktx ingest always builds enriched context (KLO-721) (#237)

Fast mode (the ktx ingest --fast/--deep database-ingest depth toggle) is removed.
ktx ingest now always builds the full enriched ("deep") context. There is no
structural fallback: a database connection without a configured model and
embeddings fails the enrichment-readiness preflight before any work runs, with
a 'Run ktx setup to configure a model and embeddings' hint.

- Remove --fast/--deep flags, the per-connection context.depth field, and the
  ktx setup depth prompt (delete setup-database-context-depth.ts).
- Rename ingest-depth.ts -> connection-drivers.ts; ingest always requests scan
  mode 'enriched'; readiness gate (enrichmentReadinessGaps) runs for every
  database target.
- Drop the database-context-depth telemetry step (Node + Python schema mirrors
  regenerated).
- Update CLI, setup, context-build view, docs, the public ktx skill, and the
  release-smoke / artifacts scripts (now assert the no-LLM guard failure).

ktx status --fast (a separate network-probe flag) is unchanged.

Follow-ups: KLO-726 (live progress for ktx ingest --all), KLO-727 (restore
credentialed successful-ingest release smoke coverage).

packages/cli/src/commands/ingest-commands.ts

@@ -29,8 +29,6 @@ export function registerIngestCommands(
     .usage('[options] [connectionId]')
     .argument('[connectionId]', 'Configured connection id to ingest (omit to ingest all)')
     .option('--all', 'Ingest all configured connections', false)
-    .addOption(new Option('--fast', 'Use deterministic database schema ingest').conflicts('deep'))
-    .addOption(new Option('--deep', 'Use AI-enriched database ingest').conflicts('fast'))
     .addOption(new Option('--query-history', 'Include database query-history usage patterns').conflicts('noQueryHistory'))
     .addOption(new Option('--no-query-history', 'Skip database query-history usage patterns'))
     .option('--query-history-window-days <days>', 'Query-history lookback window for this run', parsePositiveIntegerOption)
@@ -87,8 +85,6 @@ export function registerIngestCommands(
       all: selection.kind === 'all',
       json: options.json === true,
       inputMode: options.input === false ? 'disabled' : 'auto',
-      ...(options.fast === true ? { depth: 'fast' as const } : {}),
-      ...(options.deep === true ? { depth: 'deep' as const } : {}),
       queryHistory,
       ...(options.queryHistoryWindowDays !== undefined ? { queryHistoryWindowDays: options.queryHistoryWindowDays } : {}),
       cliVersion: context.packageInfo.version,