cop cycle path: cycles.jsonl schema check — fixes[] must be objects with id #5736

Refs #5510. Operator ruling 5, verbatim (relayed by aprender-57): "Writer defect: your cycles.jsonl emits fixes[] as strings, which breaks loops.sh. Emit {id,...} objects. Add a cycles.jsonl schema check to your CI."

Loss

A malformed cycles.jsonl row (a fixes[] entry that is a bare string, not an object) is accepted on the cop cycle path, so downstream readers fail or silently skip the row.

Change

Two parts: (1) the writer emits fixes[] as {id,...} objects, never strings; (2) add a schema check to CI: every fixes[] element must be an object with an id. A violating row is rejected with the row number and the offending element.

Falsifiers (test first)

• A row whose fixes is ["abc"]: the check FAILs and names the element.
• A row whose fixes is [{"id":"x"}]: PASS.
• A row with fixes: [] or no fixes: PASS (empty is valid).
• A row with {"fixes":[{"note":"no id"}]}: FAIL (object without id).

Scope

One check, one ticket, ≤200 changed lines. Owner aprender-w5018. Work on a branch; no PR until the open count is ≤10 (operator freeze, drafts counted).

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