chore(main): release 0.4.0

[air-gapped-release-bot]

🚀 A new release is ready to publish

0.4.0 (2026-04-12)

Features

• folder: compute per-group rollup metadata at flush time (b6b235d)
• folder: enrich text-mode compact marker with time range and rollups (0d019ff)
• folder: retire rollup placeholders with corpus-calibrated values (a896ae5)
• format: add --format json emitting JSONL with group and summary records (cac1a8b)

Bug Fixes

• pass crates.io OIDC token to cargo publish via env var (0bfda2a)
• pass crates.io token explicitly to cargo publish (2552e67)

Reverts

• restore original cargo publish pattern without --token (08fffe7)

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Merging creates a draft GitHub release. Review the release notes, add highlights if needed, then publish.

[air-gapped-release-bot]

🤖 Created releases:

• v0.4.0

🌻