docs: add agent bootstrap quickstart and consolidate documentation

- Add BOOTSTRAP__AI_Agent_Quickstart.md — fast-path entry doc for AI agents
  covering critical rules, V3 action patterns, Redis/auth/logger_reset gotchas,
  and a mistakes-agents-have-made section
- Expand ARCH__V3_DEVELOPMENT_STANDARDS.md with merged content from
  ARCH__V3_CRUD_LEARNINGS: dependency injection reference, security/isolation
  model detail, and FastAPI/Pydantic gotchas
- Archive 4 outdated docs: GUIDE__LOCAL_DEVELOPMENT (predates Docker),
  FRONTEND_API_SAMPLES (belongs in SvelteKit repo), ARCH__UNIFIED_AGENT
  (replaced by MCP ecosystem), ARCH__V3_CRUD_LEARNINGS (content merged above)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

documentation/ARCH__V3_DEVELOPMENT_STANDARDS.md

@@ -61,7 +61,47 @@ Some objects have a richer alternate SQL view (`tbl_alt`) that adds JOINed/compu
 -   The nested search router (`api_crud_v3_nested.py`) already supports `?view=<key>` to switch between registered views. `view=default` uses `tbl_default`; `view=alt` uses `tbl_alt`; additional named views can be added to the object registry as `tbl_<name>` / `mdl_<name>`.
 -   Flat search (`api_crud_v3.py`) does not yet support `?view=` — it always uses `tbl_default`.
 
-## 4. Stability Rules
+## 4. V3 Dependency Injection Reference
+
+All V3 endpoints use granular, composable `Depends()` from `app/lib_general_v3.py`:
+
+| Dependency | Purpose |
+|---|---|
+| `get_account_context` → `AccountContext` | Resolves `account_id` with precedence: Header → Query Token → Bypass Header. Raises 403 on guest/missing context. |
+| `PaginationParams` | Standardizes `limit` and `offset`. |
+| `StatusFilterParams` | Handles `enabled` and `hidden` filtering. |
+| `SerializationParams` | Controls Pydantic serialization (`by_alias`, `exclude_unset`). |
+| `DelayParams` | Optional latency simulation (`?delay=N`) via `await asyncio.sleep()`. |
+
+`AccountContext` also carries `administrator`, `manager`, and `super` flags, populated by a deferred DB lookup when a JWT is present. These flags control whether account isolation is bypassed for support tasks.
+
+## 5. Security and Data Isolation
+
+### Fail-Closed Strategy
+If `account_id` or auth context is missing, the API defaults to a blocking filter (`account_id IS NULL`) — it does NOT fall back to returning all records. Never relax this.
+
+### Multi-Tenant Isolation
+- **Forced account filtering**: `apply_forced_account_filter` injects an `account_id` WHERE clause into every list/search query for non-super users.
+- **Post-retrieval verification**: Single-object GET, PATCH, DELETE include a secondary ownership check (`check_account_access`). A mismatch returns 403.
+- **Hierarchical verification**: Nested endpoints verify parent ownership before allowing operations on children.
+- **Creation guard**: On POST, the user's `account_id` is automatically forced onto the new record.
+
+### IDAA Privacy Baseline
+No IDAA object (Events, Files, Posts, Meetings) is public by default. All routes require `x-account-id` context. The sole exception is `site_domain` (used for site bootstrapping). This is a **Sev-1 class constraint** — violating it has happened before.
+
+### Bypass / Admin Access
+- `x-no-account-id: bypass` → grants super access, resolves to `account_id=1` (One Sky IT Demo). Use only in internal/development utilities; do not expand its use.
+- JWT query parameter (`?jwt=...`) is supported for download links and share URLs where custom headers cannot be provided.
+
+## 6. FastAPI and Pydantic Gotchas
+
+- **`response: Response` injection**: Use it as a direct type hint in function signature. `Depends(Response)` is not valid and causes router initialization failures.
+- **Parameter order**: In function signatures, arguments without defaults must come before `Depends()` arguments.
+- **`asyncio.sleep()` not `time.sleep()`**: Blocking the event loop in an async endpoint causes worker timeouts and `502 Bad Gateway` under load.
+- **Pydantic V1 only**: Do not use V2-only features (`computed_field`, `model_validator`, etc.). The migration is a separate planned project — see strategic goals in `TODO__Agents.md`.
+- **`obj_type_kv_li` in `ae_obj_types_def.py`**: Supports both modern keys (`tbl`, `mdl`) and legacy keys (`table_name`, `base_name`). Legacy V2 endpoints depend on the legacy keys — do not remove them until V1/V2 are fully retired.
+
+## 7. Stability Rules
 
 1.  **Baby Step Testing**: Restart Docker and verify root health after *every* modular change.
 2.  **Avoid Shadowing**: Never name a module part of the `app.` package the same as a common instance variable (e.g., avoid `app.middleware` package if you use `app = FastAPI()`).