feat(job): show post-import notes from item README on import-set

[clavery]

Summary

Adds post-import notes to b2c job import-set. Many site-import migrations require manual, instance-specific follow-up that cannot live in a site archive — enabling a site preference, wiring a service credential in Business Manager, flipping a feature toggle. This lets each migration document that follow-up in a README.md (or README) at the top of the item's directory, and surfaces it in a consolidated summary after the run.

Also adds a dedicated, opt-in b2c-cli:b2c-import-set-migrations skill for the full migration workflow.

Behavior

• Each item directory may contain a README.md (preferred) or README; its trimmed contents become the item's note. Zip items and the set's top-level README are not treated as item notes.
• After a run, notes print only for items applied in this run — already-applied (skipped) items don't re-announce their notes, so the summary reflects only what just changed.
• --dry-run previews notes for pending items so operators can review manual steps before importing.
• With --json, nothing extra prints; each item's note is available on the item in the JSON result.

Example output:

Import set complete: 1 imported, 3 skipped

Post-import notes:

  20260801T140000-add-preferences
    # Add feature-X preferences
    Set the Feature X API endpoint in Business Manager (differs per environment).

Changes

• SDK (operations/jobs/import-set.ts): adds note? to ImportSetItem, read during discoverImportSet (README.md > README, empty → undefined, directories only). Flows into results via the existing spread.
• CLI (commands/job/import-set.ts): adds logNotes(), called after the summary line in non-JSON mode.
• New skill b2c-cli:b2c-import-set-migrations: dedicated migration workflow guide (layout, UTC naming, post-import notes, receipts/idempotency, set IDs, locking, CI/CD, recovery). Framed as an optional, opt-in, project-level approach — the agent follows it where a project has adopted it and may propose it where the goal fits, but does not silently restructure one-off imports into import sets. Cross-linked from the b2c-job and b2c-site-import-export skills, and ships with evals/trigger-evals.json.
• Docs: new "Post-import notes" section in docs/cli/jobs.md.
• Tests added for SDK discovery/precedence/result-carrying and CLI rendering (run + dry-run).

[github-actions]

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