feat(ogar-vocab): canonical_concept_name — the id → concept-name reverse map

[AdaWorldAPI]

What

Adds the inverse of canonical_concept_id:

pub fn canonical_concept_name(id: u16) -> Option<&'static str>

A linear scan over the existing CODEBOOK (the (name, id) source of truth).
Ids are unique in the codebook — now asserted by a round-trip test over all 39
entries — so the mapping is 1:1 and round-trips both ways:
canonical_concept_id(canonical_concept_name(id)?) == Some(id).

id	→ name
0x0202	commercial_document
0x0103	billable_work_entry
0x0204	billing_party
0xFFFF / 0x0000	None

Why

This is the capability odoo-rs filed as PROBE-OGAR-ID-TO-CONCEPT-NAME
(its specs/UPSTREAM_WISHLIST.md). A consumer that resolved a classid via a
port alias (name → id) needs the id → concept-name direction to:

1. stamp a readable COMMENT 'commercial_document (classid:0x00020202)'
   into emitted SurrealQL DDL (today it can only stamp the hex), and
2. populate Class::canonical_concept from an id so schema_classids
   collapses into a derived view over Class::canonical_id() —

without copying the codebook locally, which the Core-First doctrine forbids
(the consumer must pull from the Core, not mint a parallel registry). The
forward+reverse pair also resolves the lexical asymmetry the consumer can't:
both sale.order and account.move resolve to 0x0202 → commercial_document,
where neither name lexically is the concept.

Verified

• 2 new tests: canonical_concept_name_round_trips (all 39 CODEBOOK entries,
  both directions — doubles as the id-uniqueness guard) +
  canonical_concept_name_known_ids_and_none_for_unknown.
• Full ogar-vocab suite 85 passing, 0 failed.
• clippy clean on the new code (exit 0).

Additive, zero behaviour change, no symbol removed. Unblocks the odoo-rs
name-enrichment + canonical_concept fusion (follow-on PR once this lands).

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