release: cut v2.2.1 (housekeeping patch)

[doublegate]

Summary

Cuts v2.2.1, a housekeeping patch shipping everything merged to main since the v2.2.0 "Capstone" tag:

• PR chore(scripts/gg): archive Game Genie re-key research/verification helpers #304 — Game Genie re-key research tooling archived to scripts/gg/
• PR chore(deps): consolidate 6 Dependabot bumps (pollster 1.0, wide 1.5, tungstenite 0.30, +patches) #305 — six Dependabot bumps consolidated with zero source changes (pollster 0.4→1.0, wide 0.7→1.5, tungstenite+tokio-tungstenite 0.29→0.30, bytemuck/cc patch, actions/setup-python v5→v6)
• PR docs(changelog): record the PR #305 dependency consolidation #306 / docs(changelog): record the PR #304 Game Genie re-key tooling archival #307 — their CHANGELOG records
• PR chore(tools): archive the 2A03-revision DMA divergence probe #308 — the 2A03-revision DMA-divergence probe archived to scripts/probes/
• PR test(fds): wire TakuikaNinja's FDS hardware-verification probes #309 — four gitignored, RUSTYNES_FDS_BIOS-gated smoke tests against TakuikaNinja's FDS $4023/mirroring/audio-register/DRAM-watchdog hardware-verification probes

Zero accuracy, feature, or core changes. The deterministic #![no_std] chip stack, save-state/TAS/netplay-replay formats, and every golden vector are untouched — AccuracyCoin holds 141/141 (100.00%), unchanged from v2.2.0.

Version bump scope

Cargo.toml's [workspace.package] version is the single source of truth — every crate inherits via version.workspace = true (confirmed: cargo clippy --workspace reports v2.2.1 for all 18 crates):

• Cargo.toml / Cargo.lock: 2.2.0 → 2.2.1
• CHANGELOG.md: renamed [Unreleased] → [2.2.1] - 2026-07-15, added a fresh empty [Unreleased] above it
• docs/STATUS.md, README.md (badge + "Current Release" section), AGENTS.md (canonical — CLAUDE.md/GEMINI.md are symlinks to it): updated "current release" narrative to v2.2.1, reframing v2.2.0 "Capstone" as the prior release this patch sits on top of
• .github/release-notes/v2.2.1.md: authored for release-auto.yml's override path

Deliberately not touched:

• The Android app's versionCode/versionName and the iOS app's MARKETING_VERSION — these track their own host-only release cadence (frozen at their v2.0.x readiness points) and are decoupled by design from the desktop/core version until the joint mobile store launch at v2.3.0.
• to-dos/ROADMAP.md's "Current release" line — already stale (citing v2.1.0) before this patch; a pre-existing narrative-staleness issue orthogonal to this release's scope.

Test plan

• cargo fmt --all --check — green
• cargo clippy --workspace --all-targets -- -D warnings — green, all 18 crates confirm v2.2.1
• cargo test --workspace — exit 0, zero failures
• markdownlint on every touched doc — green
• Main's post-test(fds): wire TakuikaNinja's FDS hardware-verification probes #309-merge CI confirmed fully green, including the full test-roms feature battery

[Copilot]

Pull request overview

This PR cuts v2.2.1, a housekeeping patch release that bumps the workspace version and updates release-facing documentation/notes while keeping the emulator core and accuracy surfaces unchanged.

Changes:

• Bumped workspace version 2.2.0 → 2.2.1 (and propagated through Cargo.lock).
• Updated release narratives in README.md, docs/STATUS.md, AGENTS.md, and CHANGELOG.md to reflect v2.2.1 as the current release.
• Added GitHub release-notes override file for automation: .github/release-notes/v2.2.1.md.

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
README.md	Updates badges + “Current Release” section to v2.2.1 housekeeping-patch narrative.
docs/STATUS.md	Updates the status header block to reflect v2.2.1 as the current release.
CHANGELOG.md	Adds a v2.2.1 section dated 2026-07-15 and leaves a fresh empty Unreleased section above.
Cargo.toml	Bumps [workspace.package] version to 2.2.1.
Cargo.lock	Propagates the workspace version bump across the workspace crates.
AGENTS.md	Updates the canonical “Current release” narrative and related guardrails to v2.2.1.
.github/release-notes/v2.2.1.md	Adds release notes for release-auto.yml’s override path.

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[gemini-code-assist]

Code Review

This pull request prepares the repository for the v2.2.1 housekeeping patch release by bumping the workspace and crate versions from v2.2.0 to v2.2.1 in Cargo.toml and Cargo.lock. It also updates the release notes, CHANGELOG.md, README.md, AGENTS.md, and docs/STATUS.md to document the changes in this patch, which include archived dev-tooling, consolidated dependencies, and new gitignored FDS hardware-verification probes. There are no review comments to assess, so no further feedback is provided.

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