Generated HTTP recipes send no request body

The 82 recipes under projects/ores.http/scripts/library/ are tangled from the ores.doc.http-recipe facet, and its template http_recipe.org.mustache emits only a method line, an Accept header, an optional Authorization header and the status assertion. It emits no body and no Content-Type, so a write arrives empty.

57 of the 82 use a body-carrying method — 45 POST, 6 PUT, 6 DELETE — and none carries a body. Replaying the tags group against the running gateway gives 4 PASSED and 6 FAILED, every failure reading actual value is <400>: add, set, get-many, put-many, delete and delete-many.

The path sentinel is wrong for HTTP as well. _sentinel_for_field falls back to the shell absent token __none__ for std::string and for every unmapped type, so 17 recipes write that token straight into the request URL, as in DELETE /api/v1/assets/tags/__none__.

A recipe exists to prove the wiring between the route and the handler, and an endpoint that answers 400 proves the opposite of what its recipe asserts. The 57 recipes are therefore worse than absent: each reports a pass-shaped document that cannot pass. The fault is at the source, in one template and one builder, so one fix corrects all of them.

The typed inputs the fix needs already exist for the shell surface: the entity_shell_plan keys, writes and put_writes commands, and the per-field sentinels. Their values are shell tokens rather than JSON, so the facet needs a JSON-typed sentinel and a body block per write endpoint. A regression test should assert that a write recipe carries a body.

Found while closing the ores.http clean-up. The Generate literate HTTP recipes story is marked DONE on an acceptance line — every tangled Hurl file runs against the live gateway unchanged — that these 57 recipes do not meet.

• projects/ores.codegen/library/templates/http_recipe.org.mustache — the tangle target that emits no body; its literate source is ores.doc.http-recipe.recipe.org.
• projects/ores.codegen/src/codegen/org_loader.py:4289 — http_recipe_document, the builder; _http_sample_path at :4339 builds the path sentinel; _sentinel_for_field and _SENTINEL_VALUES at :4885 supply __none__.
• projects/ores.http/scripts/library/tags/tags-get-many.hurl — asserts HTTP 200 and receives 400.
• projects/ores.http/scripts/library/images/images-delete.hurl — the __none__ sentinel in the request URL.
• doc/agile/versions/v0/sprint_26/http_recipe_harness/story.org — the story whose acceptance this defect contradicts.

• Fix the shell recipe sentinel for optional columns — the same sentinel function, on the shell surface.