chore(release): v1.2.1

[vxcozy]

Summary

Patch-level bump to 1.2.1 + CHANGELOG entry.

Shipping in v1.2.1

Fixed (CLI-97):

• Sakura + heartbeat visualisers now react at normal listening volume. Same class of amplitude-scaling bug as the v1.2.0 bar-family fix, caught three viz later during live-testing. Both now flow through scaling.rs AGC helpers (SpectrumScaler for sakura's magnitude-domain intensity; new SampleScaler for heartbeat's bipolar sample domain).

Added (CLI-95):

• Homebrew tap auto-bumps on every release. release.yml gained a homebrew-tap job that pushes the updated formula to vxcozy/homebrew-tap after the build matrix + release step succeed. RC tags skip the tap-bump. No more 15-minute "release shipped but `brew upgrade` is a no-op" window.

Removed:

• Firework visualiser (23 → 22 entries). Onset-triggered particle bursts duplicated pulse's niche. Deletion confirmed during the CLI-97 live-test when all three black-screen viz were found in the same amplitude-math family. p × 2 from the default carousel position now lands on the fixed sakura.

⚠️ Must be cut as `v1.2.1-rc1` first

release.yml changed in PR #63 (the tap-bump automation). No tag push has exercised the new full pipeline yet — workflow_dispatch validated the tap-bump job in isolation, but build + release + tap-bump chained success path is untested.

Per the pre-push CI parity rule, the first tag after any release.yml change must be an RC dry run. After this PR merges:

1. Cut `v1.2.1-rc1`
2. Watch release.yml — expect 6 green jobs: 4 build targets, release, tap-bump skipped via `if: !contains('-rc')`
3. If green, cut real `v1.2.1` tag
4. Watch release.yml again — now 6 green jobs including tap-bump actually running
5. `brew upgrade clitunes` lands v1.2.1 automatically

Release-sensitivity check

File class	Changed since v1.2.0?
`release.yml`	✅ yes (PR #63) — owes RC
`rust-toolchain.toml`	no
`Cargo.toml` structural	no (only version bump in this PR)
`Cargo.lock` structural	no
Workspace members	no

Test plan

• cargo fmt --check
• cargo clippy --workspace --all-targets -- -D warnings
• cargo test --workspace --all-features
• After merge: cut `v1.2.1-rc1`, confirm release.yml green (5 jobs + tap-bump skipped)
• After RC green: cut `v1.2.1`, confirm release.yml green (6 jobs, tap-bump commits to homebrew-tap)
• After tap-bump commit: `brew update && brew upgrade clitunes` reports 1.2.1 without manual intervention

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