Bring back #857, #862 and #825

[Soph]

Due to #869 we have to remerge PRs #857, #862 and #825

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Note

Medium Risk
Touches release automation (GitHub Actions/GoReleaser) and adds new parsing/version-check paths for nightly/Copilot transcripts, which could impact publishing and runtime behavior if misconfigured. Core logic changes are scoped and covered by new tests/fixtures but still affect user-facing release/update flows.

Overview
Introduces an automated nightly release pipeline: a new nightly.yml scheduled workflow creates/pushes nightly tags via scripts/create-nightly-tag.sh, and mise-tasks/release can generate/push stable + nightly tags locally.

Updates the release process to treat *-nightly.* tags as prereleases: release.yml now detects prerelease vs stable, generates nightly release notes from git log, and .goreleaser.yaml enables prerelease: auto, adds a Homebrew entire@nightly cask (with conflicts/conditional uploads) and disables Discord announcements for prereleases.

Improves CLI runtime behavior: versioncheck now fetches the latest nightly when running a nightly build, the lifecycle session-start banner is formatted differently for codex, and transcript compaction adds GitHub Copilot JSONL format support with fixtures/tests.

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[Copilot]

Pull request overview

This PR reintroduces previously merged work (#857, #862, #825) after a main-branch force-push, restoring: nightly release automation, Copilot CLI transcript compaction support, and Codex session-start banner formatting.

Changes:

• Add nightly tagging + release automation (new nightly workflow, tag script, GoReleaser config updates, and a mise run release helper).
• Extend version checking to use a separate “nightly” update channel.
• Add Copilot CLI events.jsonl → normalized transcript.jsonl compaction, plus fixtures/tests; adjust Codex session-start banner formatting for single-line rendering.

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
scripts/create-nightly-tag.sh	Generates nightly tag names based on latest stable tag and HEAD.
mise-tasks/release	Helper task to create/push stable and (optionally) nightly tags.
cmd/entire/cli/versioncheck/versioncheck.go	Adds nightly-channel detection and latest-nightly fetching logic.
cmd/entire/cli/versioncheck/types.go	Adds githubReleasesURL for nightly release listing.
cmd/entire/cli/versioncheck/versioncheck_test.go	Adds tests for nightly detection + nightly fetch logic.
cmd/entire/cli/transcript/compact/copilot.go	Implements Copilot CLI transcript compaction + format detection.
cmd/entire/cli/transcript/compact/compact.go	Routes Copilot-format transcripts to the new compactor.
cmd/entire/cli/transcript/compact/codex.go	Renames codexTypeMessage constant used for detection.
cmd/entire/cli/transcript/compact/copilot_test.go	Fixture-based test for Copilot transcript compaction.
cmd/entire/cli/transcript/compact/testdata/*	Copilot input/output fixtures for compaction.
cmd/entire/cli/lifecycle.go	Adds agent-specific session-start banner formatting (Codex single-line).
cmd/entire/cli/lifecycle_test.go	Tests for Codex single-line banner and default multiline banner.
.goreleaser.yaml	Enables auto prereleases + nightly Homebrew cask routing and announcement rules.
.github/workflows/release.yml	Adds prerelease detection and nightly release-notes generation.
.github/workflows/nightly.yml	Adds scheduled workflow to create/push nightly tags.

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