chore: add S3 release packaging

[congziqi77]

Adds S3 packaging workflow and local release scripts for internal Git-AI builds.

Summary by CodeRabbit

• New Features

  • Added GitHub Actions workflow for automated release builds and S3 publishing with configurable deployment options
  • Installation scripts now support downloading from custom base URLs

• Documentation

  • Added comprehensive S3 release packaging guide with deployment and verification steps

• Bug Fixes

  • Improved handling of empty commit mappings with proper event tracking

• Tests

  • Added regression test for rebase mapping scenarios

• Chores

  • Added local release tooling script for S3 deployment

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 8f09fc0b-afe6-4ec8-bb35-8eaa41f450fa

📥 Commits

Reviewing files that changed from the base of the PR and between 4c3be1c and 6133e83.

📒 Files selected for processing (10)

• .github/workflows/release-s3.yml
• install.ps1
• install.sh
• s3-release-packaging-guide.md
• scripts/release-s3-local.sh
• src/daemon.rs
• src/git/repo_state.rs
• src/git/rewrite_log.rs
• tests/integration/main.rs
• tests/integration/rebase_empty_mapping.rs

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📝 Walkthrough

Walkthrough

This PR introduces S3-based release distribution infrastructure and improves rebase event tracking. It adds a GitHub Actions workflow and local Bash script for packaging and uploading binaries to S3, updates installer scripts to support custom base URLs, documents the release workflow, extends the rewrite log with a skipped-rebase event, and enhances daemon head resolution to prevent empty-mapping collisions with a regression test.

Changes

S3 Release and Installation Infrastructure

Layer / File(s)	Summary
Installer script base URL support install.sh, install.ps1	Both installers now accept a BASE_URL placeholder that release builds populate with a custom S3 or internal endpoint, directing binary downloads away from GitHub Releases when configured.
Local release packaging and S3 upload script scripts/release-s3-local.sh	New Bash script orchestrates platform-specific binary packaging, SHA256 checksum generation, install script templating with injected version/base-URL/checksums, optional channel releases, and S3 uploads via aws or s3cmd, with dry-run and multi-platform aggregation support.
GitHub Actions release-to-S3 workflow .github/workflows/release-s3.yml	Manual release workflow builds and strips Linux (musl), macOS (Intel and ARM), and Windows binaries across a job matrix, generates checksums and templated install scripts, uploads artifacts, and syncs the release bundle to S3 when not in dry_run.
Release packaging and installation documentation s3-release-packaging-guide.md	Comprehensive guide covering prerequisites, dry-run and production upload procedures, post-deployment verification, environment parameter reference, multi-platform aggregation workflow, version number semantics, and troubleshooting.

Rebase Skipped Event and Semantic Head Resolution

Layer / File(s)	Summary
RebaseSkipped event type and constructor src/git/rewrite_log.rs	RewriteLogEvent gains a RebaseSkipped variant wrapping RebaseSkippedEvent, which carries original head, new head, interactive flag, and skip reason (e.g., "empty_commit_mapping").
Semantic head matching in rebase segment resolution src/git/repo_state.rs	resolve_rebase_segment_for_worktree accepts optional semantic head hints and uses a three-stage fallback: exact (original_head, new_head) match, then new_head-only, then original_head-only, before falling back to existing heuristics.
Daemon rebase event synthesis and empty mapping handling src/daemon.rs	Daemon computes semantic heads from RebaseComplete and PullCompleted events, passes them into stable head resolution, emits RebaseSkipped events (instead of silently skipping) when commit mapping is empty, and treats skipped rebases as already-processed.
Regression test for empty rebase mapping tests/integration/rebase_empty_mapping.rs, tests/integration/main.rs	Integration test verifies that later real rebases do not adopt stale no-op reflog segments, preserving AI authorship notes and metadata across multiple rebase operations.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Poem

🐰 With S3 buckets and semantic heads so clear,
New releases hop to the cloud without fear.
Empty mappings now tracked, no more silent skips—
Just checksums and channels on eager deployment ships! 🚀

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/s3-release-packaging

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