docs(skills): the objectstack-data skill leads a hook author to the save notice

The rule index's rules/lifecycle.md entry names the save notice, and
references/data-hooks.md carries a ctx.notice row in the sandbox table and a
notice member in the HookContext listing, each pointing at the Save Notice
section. Growth is paid by deleting restated prose in the same files, and
both token-ratchet rows are re-locked at the landed counts.

Co-Authored-By: Claude <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01L9qibx4SVi1CLmwbLz82b7

Author: claude

.changeset/28819-save-notice-discoverable.md

@@ -0,0 +1,10 @@
+---
+'@objectstack/skills': patch
+---
+
+docs(skills): the objectstack-data skill now leads a hook author to the save notice
+
+Clause-②: no
+Metadata-protocol: none
+
+The `objectstack-data` rule index described `rules/lifecycle.md` as retention-only, and `references/data-hooks.md` listed no `notice` member, so an author writing a save hook from this skill never found `ctx.notice(message)`. The index entry now names the save notice, and the sandbox `ctx.*` table and the `HookContext` listing each carry a `notice` row that points at `rules/lifecycle.md` § Save Notice. Growth is paid by same-file deletions of restated prose; both token-ratchet rows are re-locked down at the landed counts.

scripts/check-skills-token-ratchet.mjs

@@ -510,7 +510,10 @@ export const CEILINGS = new Map([
   // shrank to 689 characters (card item 3). One pointer line per moved block.
   // 6128 -> 6123: A2′ — the release-stamp line left the count (see
   // STAMP_LINE_REPIN); the file's count fell by the same 5, headroom unchanged.
-  ['skills/objectstack-data/SKILL.md', 6123],
+  // 6123 -> 6078: re-locked at the landed count. The rule index's `rules/lifecycle.md`
+  // entry names the save notice (+16); the `lifecycle` property row dropped the
+  // bounding-policy clause that entry and `rules/lifecycle.md` already carry (-25).
+  ['skills/objectstack-data/SKILL.md', 6078],
   ['skills/objectstack-formula/SKILL.md', 5997], //     -53 (was 6055), then -5 A2′ (was 6002)
   ['skills/objectstack-i18n/SKILL.md', 6333], //        -11 (was 6349), then -5 A2′ (was 6338)
   // 12705 -> 12984 (2026-08-31 app-repo-principles raise, see the block above).
@@ -678,7 +681,12 @@ export const CEILINGS = new Map([
   // headings); the row carried 2,727 tokens of headroom left by an earlier
   // shrink that nobody re-locked, so the TOC needed no raise. Pinned AT the
   // measurement — zero headroom, the ratchet's steady state.
-  ['skills/objectstack-data/references/data-hooks.md', 10066],
+  // 10066 -> 10011: re-locked at the landed count. A `ctx.notice` row in the sandbox
+  // table and a `notice?` member in the HookContext listing (+95), paid by three
+  // same-file restatements: the reverse-engineering aside in the `body` intro, the
+  // `tenantId` blockquote (the listing comment and the two-axes note say both
+  // halves) and the `ctx.user` paragraph under the `??` line that shows it (-141).
+  ['skills/objectstack-data/references/data-hooks.md', 10011],
   ['skills/objectstack-data/rules/datasources.md', 911],
   // -552 (was 3584): re-locked at the landed count (#16374) after PR #16187
   // (the two `tree` rows) and PR #16369 (the ASCII decision tree deleted)

skills/objectstack-data/SKILL.md

@@ -42,7 +42,7 @@ Detailed rules, with incorrect/correct examples:
 - **[Relationships](./rules/relationships.md)** — lookup vs master_detail, junction patterns, delete behaviors
 - **[Validation Rules](./rules/validation.md)** — All validation types, script inversion, severity levels
 - **[Index Strategy](./rules/indexing.md)** — btree/gin/gist/fulltext, composite indexes, partial indexes
-- **[Data Lifecycle & Retention](./rules/lifecycle.md)** — `lifecycle` classes (record/audit/telemetry/transient/event), retention/TTL/rotation/archive policies; ❗ append-only objects must declare one (distinct from lifecycle *hooks* below)
+- **[Data Lifecycle & Retention](./rules/lifecycle.md)** — `lifecycle` classes (record/audit/telemetry/transient/event), retention/TTL/rotation/archive policies; ❗ append-only objects must declare one (distinct from lifecycle *hooks* below); plus the **save notice** a hook hands the saver (`ctx.notice`)
 - **[Lifecycle Hooks](./references/data-hooks.md)** — the lifecycle events, `handler` vs sandboxed `body` (ctx + capability contract), registration, canonical patterns
 - **[Datasources & Federation](./rules/datasources.md)** — `defineDatasource`, external/federated objects (`remoteName`/`columnMap`), auto-connect gating, credentials; ❌ no `field.columnName` on external objects
 - **[Security & Access Control](./rules/security.md)** — permission sets, assignment rows, RLS policies, `secret` / `requiredPermissions`, `tenancy`, platform-global posture
@@ -90,7 +90,7 @@ the publish door rejects it before that:
 | `titleFormat` | — | **Refused (ADR-0079)**: a save and `os validate` refuse it (`title-format-retired`). Move it to `nameField`; a composite title follows the `nameField` row |
 | `enable` | — | Capability flags (trackHistory, searchable, apiEnabled, etc.) |
 | `fieldGroups` | — | Ordered list of logical field groups for forms/detail pages (see [Field Groups](./references/examples-objects.md#field-groups-mvp)) |
-| `lifecycle` | `record` semantics (permanent) | Data retention/rotation/archival contract. **Required for append-only, high-write-rate objects** — a `telemetry`/`transient`/`event`/`audit` class must declare a bounding policy or parsing fails (see [Data Lifecycle & Retention](./rules/lifecycle.md)) |
+| `lifecycle` | `record` semantics (permanent) | Data retention/rotation/archival contract. **Required for append-only, high-write-rate objects** (see [Data Lifecycle & Retention](./rules/lifecycle.md)) |
 
 ### Object Capabilities (`enable`)
 

skills/objectstack-data/references/data-hooks.md

@@ -310,9 +310,7 @@ onError: 'log'
 
 A hook can carry its logic in one of two shapes. Everything above this point
 showed the inline **`handler`** function; the section below documents the
-**`body`** form — the one a metadata-only runtime actually executes, and the one
-that was previously undocumented (you had to reverse-engineer
-`@objectstack/runtime` to use it).
+**`body`** form — the one a metadata-only runtime actually executes.
 
 ### `body` (sandboxed) vs `handler` (inline) — pick one
 
@@ -366,6 +364,7 @@ The sandbox is handed a **JSON snapshot** of these (built by
 | `ctx.api` | object | Cross-object CRUD. Gated by `api.read` / `api.write` — see below. |
 | `ctx.log` | `{ debug, info, warn, error }` | Gated by `log`. Call **`ctx.log.info(msg, data?)`** — `ctx.log` is an **object, not** callable as `ctx.log(msg)`. Emission is **best-effort** (see Troubleshooting). |
 | `ctx.crypto` | `{ randomUUID }` | Gated by `crypto.uuid`. |
+| `ctx.notice` | `(message) => void` | **Tell the saver what this save set in motion** — answered as the create/update `notice`, shown on the save toast. No capability; insert/update only; last call wins. Rules: [`rules/lifecycle.md` § Save Notice](../rules/lifecycle.md#save-notice). |
 | `ctx.title` | `(field?) => Promise<string \| null>` | **Name the record, not its id.** `ctx.title()` resolves this object's `nameField`, a **formula** included (no extra read); `ctx.title('account_id')` resolves a lookup's title (needs `api.read`). `null` when there is no title, never the id. **Per door:** `body` has it; a deprecated `handler` gets it at runtime, undeclared on `HookContext` (TS2339 when annotated) — use `body`; `ql.registerHook` and a bare `ObjectQL` `bindHooks` lack it. |
 
 (Action bodies additionally receive `ctx.recordId` and `ctx.record`, and their
@@ -599,6 +598,7 @@ interface HookContext {
   // Engine access
   ql: IDataEngine;       // ObjectQL engine instance
   api?: ScopedContext;   // Cross-object CRUD API
+  notice?: (message: string) => void; // Save notice — rules/lifecycle.md § Save Notice
 
   // User info shortcut (undefined for system / unauthenticated writes)
   user?: {
@@ -622,14 +622,6 @@ predicates, and in seed rows. Read it as **`organizationId`**:
 const org = ctx.user?.organizationId ?? ctx.session?.organizationId;
 ```
 
-> The former `ctx.session.tenantId` alias was removed in v16 — read the
-> org under `organizationId`. (The generic driver-layer `execCtx.tenantId` /
-> `DriverOptions.tenantId` isolation knob is a separate axis and is unaffected.)
-
-`ctx.user` is the ergonomic shortcut for an authenticated caller; it is
-`undefined` for system / unauthenticated writes, so read `ctx.session?.organizationId`
-when a hook must work regardless of whether a user resolved.
-
 > **Two isolation axes — don't conflate them.** `organization_id` is
 > **org row-scoping**: many organizations share one database and every row
 > carries its owning org (`current_user.organizationId` filters reads/writes;