feat: fold practice into the shared file, not project status

[hibeekaey]

The fold prompt told the synthesizer to "fold the new memories into the file's curated sections" and nothing else, so it did exactly that — including a project's resume point, what was deployed, backlog counts and workflow ids, all merged into the file every agent on the machine reads. That had to be cut out by hand today, twice: once from the curated sections and once more after the next sync gathered the same memory stores again.

The prompt now says what the file is for. A new memory contributes the practice it teaches, never the status it records; anything that must be edited when work moves is dropped rather than folded; a memory that is entirely status contributes nothing; and the fallback Promoted from <agent> section is no longer a home for status the rules just told the model to drop.

There is no config route to this — --only/--skip filter which agents receive the file, not the gather — so it had to be the prompt.

Validation: new assertions in tests/fold_test.sh pin that the rules are actually sent, mutation-proven by removing one rule and watching it fail. All 13 suites pass, sh -n and shellcheck -S error clean.

Note this carries a VERSION bump to 1.12.0, so merging it releases.

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-21T18:14:06.843551Z	a91db81	PR opened

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