The firehose switches (HOSES, INDEX_LEGACY_KINDS) are env-only. Add CLI flags for ad-hoc runs, with flags overriding env (env stays the default so pm2/.env keep working).

Flags

• --hoses <list> / --hoses=<list> — comma list of hose names (overrides HOSES).
• --no-legacy — disable the legacy raw-upsert fallback (overrides INDEX_LEGACY_KINDS).
• --legacy — force it on.
• --help / -h — usage, then exit.

Example: node index.js --hoses profiles --no-legacy

Design

• parseArgs(argv) → an env-overlay object ({ HOSES?, INDEX_LEGACY_KINDS?, help? }); only keys the user passed are present.
• runIndexer builds env = { ...process.env, ...parseArgs() } and passes it to planIngest — so flags win, env is the fallback, and planIngest stays pure.
• --help handled at the CLI entry points (index.js, src/indexer.js), printing usage and exiting.

Acceptance

• node index.js --hoses profiles --no-legacy runs the profiles hose only, no legacy kinds.
• Env still works unchanged when no flags are given; flags override env when both are set.
• --help prints usage. npm test green incl. new parseArgs tests.