fix(docs): regenerate bank-template-schema.json and guard drift

[mrkhachaturov]

Summary

hindsight-docs/static/bank-template-schema.json is hand-edited. Nothing regenerates it and nothing checks it. Three PRs have changed BankTemplateManifest since it was last touched:

• fix(config): validate entity_labels structure on PATCH #902 flipped BankTemplateConfig.entity_labels from list[str] to list[dict[str, Any]]
• fix(bank-template): align BankTemplateConfig with _CONFIGURABLE_FIELDS #1044 added ten BankTemplateConfig fields (retain_default_strategy, retain_strategies, retain_chunk_batch_size, mcp_enabled_tools, four consolidation_* fields, max_observations_per_scope, reflect_source_facts_max_tokens, llm_gemini_safety_settings)
• feat(api): add recall controls to mental model trigger #1048 added three MentalModelTrigger fields (include_chunks, recall_max_tokens, recall_chunks_max_tokens)

None of the bundled templates exercise any of these fields, so check-templates.mjs kept passing. A template that uses the dict-shaped label format fails Ajv with should be string on every label.

This PR regenerates the schema from BankTemplateManifest.model_json_schema() and hooks the generator into the existing verify-generated-files CI job alongside generate-openapi and generate-clients, so the same drift guard you already rely on for those catches future schema changes.

Test plan

• ./scripts/generate-bank-template-schema.sh runs cleanly and is idempotent on re-run
• ./scripts/hooks/lint.sh — all lints pass (new Python file + ruff + ty)
• node hindsight-docs/scripts/check-templates.mjs — all 3 bundled templates still validate against the regenerated schema
• A template using entity_labels: list[dict] (dict-shaped) now validates against the regenerated schema but is rejected by the stale schema on main with should be string — confirms the drift was reachable
• CI verify-generated-files job passes the new Run generate-bank-template-schema step

[nicoloboschi]

LGTM, thank you!!