docs(m3): regroup METADATA and remove the false fallback framing

METADATA was ordered as it was written, not by topic, and used Call 1 /
Call 2 without defining them.

- Add a short METADATA preamble stating the inference flow: Call 1 vision
  proposes taxonomy, the name and short description are deterministic, Call 2
  writes the long description.
- Regroup the rows: taxonomy, then Call 1, then deterministic copy, then
  Call 2, then cross-cutting.
- METADATA-70 said the deterministic name and short description were an
  inference-off fallback; they are unconditional. It now covers only the
  inference-off description.
- METADATA-81 folded into METADATA-80 (same rule, two strings).
- METADATA-45 now names the below-threshold outcome.
- METADATA-90 now states what the fact block drives.

153 requirements; check_requirements and check_coverage both pass.

docs/contracts/CONTENT-WOO.md

@@ -11,7 +11,7 @@ Owns how listing copy is produced and the intent of the create payload. The wire
 |---|---|
 | REVIEW-10, REVIEW-15, REVIEW-40, REVIEW-50 | required prose, primary category, editability, limits |
 | METADATA-55, METADATA-60, METADATA-65, METADATA-66 | Call 2, inputs, dimension safety, logging |
-| METADATA-70, METADATA-75, METADATA-80, METADATA-81, METADATA-85, METADATA-90, METADATA-95, METADATA-110 | deterministic copy, fallback, pattern selection, fact block, overlay exclusion, control |
+| METADATA-70, METADATA-75, METADATA-80, METADATA-85, METADATA-90, METADATA-95, METADATA-110 | deterministic copy, inference-off path, pattern selection, fact block, overlay exclusion, control |
 | PUBLISH-5, PUBLISH-10, PUBLISH-15, PUBLISH-20, PUBLISH-25, PUBLISH-30, PUBLISH-31, PUBLISH-40, PUBLISH-45, PUBLISH-50, PUBLISH-55, PUBLISH-60 | payload and create outcomes |
 | SETTINGS-30, SETTINGS-65 | brand voice and geo context; create status |
 | METADATA-10, METADATA-15, METADATA-30 | categories, attributes, tags on the payload |
@@ -23,7 +23,7 @@ Three fields, three sources (`REVIEW-10`):
 1. **name** — assembled deterministically by the server from the primary wood category's title
    pattern and the dimension fact block (`METADATA-80`). The model does not write it.
 2. **short_description** — assembled deterministically as a spec line from the primary wood
-   category's short-description pattern (`METADATA-81`). The model does not write it.
+   category's short-description pattern (`METADATA-80`). The model does not write it.
 3. **description** — written by Call 2 when it runs (`METADATA-55`), from the inputs in
    `METADATA-60`; with inference off the server produces it (`METADATA-70`).
 
@@ -40,8 +40,8 @@ generation is logged (`METADATA-66`).
 ## 2. Deterministic title and short description
 
 Both patterns are assembled by the server and use only synced taxonomy terms and capture facts
-(`METADATA-80`, `METADATA-81`). Placeholders use `{field}`; every number comes from the
-deterministic pipeline, never the model (`METADATA-90`).
+(`METADATA-80`). Placeholders use `{field}`; every number comes from the deterministic pipeline,
+never the model (`METADATA-90`).
 
 The shape follows the convention a working mill store uses: descriptor-led, dimension-light titles,
 with the measurements carried separately. See "Provenance" below.

docs/contracts/PROMPTS.md

@@ -9,8 +9,8 @@ Owns prompt storage, prompt inputs, and the two inference calls.
 |---|---|
 | METADATA-5, METADATA-10, METADATA-15, METADATA-30 | taxonomy choices and cardinality |
 | METADATA-35, METADATA-40, METADATA-45, METADATA-50 | Call 1 inputs, constraints, pre-fill, precedence |
-| METADATA-55, METADATA-60, METADATA-65, METADATA-70 | Call 2 output, inputs, dimension safety, fallback |
-| METADATA-75, METADATA-80, METADATA-81, METADATA-85, METADATA-90, METADATA-95 | non-blocking, deterministic copy, pattern selection, fact block, overlay exclusion |
+| METADATA-55, METADATA-60, METADATA-65, METADATA-70 | Call 2 output, inputs, dimension safety, inference-off path |
+| METADATA-75, METADATA-80, METADATA-85, METADATA-90, METADATA-95 | non-blocking, deterministic copy, pattern selection, fact block, overlay exclusion |
 | METADATA-100, METADATA-105, METADATA-110, METADATA-115 | feat mapping, prompt storage, button, failure |
 | METADATA-66 | generation logging |
 | SETTINGS-30 | brand voice and geo context |
@@ -75,15 +75,15 @@ No provider thread id is used, and Call 1's raw prompt and result are not sent (
 - The dimension-overlay image is never sent (`METADATA-95`).
 
 **Output.** The long `description` prose. The server assembles `name` and `short_description`
-(`METADATA-55`, `METADATA-80`, `METADATA-81`). The primary wood category selects the specialized
-prompt (`METADATA-85`). The owner can edit the result (`REVIEW-40`).
+(`METADATA-55`, `METADATA-80`). The primary wood category selects the specialized prompt
+(`METADATA-85`). The owner can edit the result (`REVIEW-40`).
 
 ## 4. Fallback and templates
 
-- With inference off, the server assembles the name and short description and produces the
-  description so create never lacks prose (`METADATA-70`).
+- With inference off, the server produces the long description so create never lacks prose
+  (`METADATA-70`).
 - The deterministic title and short-description patterns live in `docs/contracts/CONTENT-WOO.md`
-  (`METADATA-80`, `METADATA-81`).
+  (`METADATA-80`).
 - The primary wood category selects the specialized Call 2 prompt (`METADATA-85`).
 - All generated text stays within the field limits in `docs/contracts/WOO-API.md` §9
   (`REVIEW-50`).