fix(inventory): model-zoo and start-training now have a code-quality caller

[LukasWodka]

The drift guard caught my own change — which is the outcome #1415 was built for.

model-zoo#115 and start-training#32 added code-quality callers this morning. Their inventory entries still read exempt: *code_quality_caller_missing, so audit on .github/develop reported:

model-zoo: code-quality.yml is marked `exempt` but a caller exists (code-quality-caller.yml)
start-training: code-quality.yml is marked `exempt` but a caller exists (code-quality-caller.yml)

Both now required # code-quality-caller.yml. Verified live: 20 of 20 repos read, no drift. Selftest 42/42.

Context on the audit that was red

The run that fired at 09:56:39 reported four findings, not two — it was triggered by .github#135 merging and ran beforerelease-train#25 merged at 09:59:03. Two of those four were the expected transient on-train drift, which cleared on its own. The other two are the ones this PR fixes, and they were never transient.

So the red audit had two independent causes stacked, and only one of them resolved itself. Worth noting because "it will go green when the pair merges" was my prediction, and it was half right.

Third instance of the same coupling today

#	fact recorded in two places	what drifted
1	release-train/repos.yml ↔ inventory release_train	tracebloc-website (.github#132)
2	same pair	model-zoo, start-training (.github#135)
3	a caller file ↔ its inventory entry	this PR

Identical shape each time: a fact asserted in two repos where only one got edited. The guard is doing exactly its job, and three catches in one day is a reasonable argument that it earns its keep — but it is also a signal that the coupling itself is the defect, not the individual misses.

Anchor text corrected

The shared code_quality_caller_missing reason still implied all nine original citations stood. It is down to three — claude-skills, docs, release-train — and the anchor now names them and what remediated the other two, so the next reader does not have to re-derive the count from grep. The anchor stays (three repos still cite it), so this is not a dangling reference.

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Note

Low Risk
Inventory-only metadata changes; no workflow or runtime behavior is modified.

Overview
Aligns repo-inventory.yml with callers that already landed in model-zoo and start-training, so the caller-drift guard stops reporting “exempt but a caller exists.”

For both repos, code-quality.yml moves from exempt: *code_quality_caller_missing to required (with code-quality-caller.yml noted in the comment). The shared code_quality_caller_missing anchor text is updated to say only claude-skills, docs, and release-train still use that exemption, and that model-zoo/start-training were remediated under backend#1420.

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