schema: add 'schema reset' command to rebuild org schemas

[maximelb]

Summary

Exposes the existing backend endpoint DELETE /orgs/{oid}/schema (resetOrgSchemas) through the Python CLI/SDK. This was previously only reachable via the Go SDK (Organization.ResetSchemas()) or a raw API call — there was no Python CLI/SDK surface for it.

Resetting schemas clears the cached schema/ontology so it rebuilds from newly observed events — useful when the recorded schema has gone stale (e.g. after telemetry shape changes) and fields are missing from schema list / schema get.

Changes

• SDK (limacharlie/sdk/organization.py): Organization.reset_schemas() → DELETE orgs/{oid}/schema. Returns the raw response dict, consistent with sibling methods (delete_org, dismiss_error).
• CLI (limacharlie/commands/schema.py): limacharlie schema reset, guarded by --confirm (exits 4 without it, mirroring the ai-memory delete convention), with register_explain text surfaced via --ai-help.
• Tests: SDK request assertion; CLI tests for the --confirm guard and happy path; a schema list regression guard; updated the lazy-loading regression's expected subcommand set.

Usage

limacharlie schema reset --confirm

Validation

• Targeted suite (SDK org / CLI commands / lazy-loading / command-map lint / discovery): 1134 passed.
• New tests pass individually.
• The pre-existing test_search_* failures on cli-v2 are unrelated (confirmed by stashing this change and re-running on the clean base branch).
• Smoke-tested: schema --help lists reset, schema reset --help shows --confirm, --ai-help renders the explain text.

Note for reviewers

The backend authorizes this destructive, org-wide endpoint with the org.get permission (lc_api-go/.../endpoint_org_info.go). Not changed here (backend concern), but worth being aware of.

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