chore(release): v2.2.0-rc.3

[DerekMarshall]

Sets the version to 2.2.0-rc.3, made with make release-prep VERSION=2.2.0-rc.3. Only Cargo.toml and Cargo.lock change. As with the earlier rcs, an rc gets no CHANGELOG section, because the 2.2.0 section covers the whole cycle.

Why another rc

Five changes merged after the rc.2 release run (v2.2.0-rc.2 was published 2026-10-14 07:40 UTC). Cutting 2.2.0 from main now would ship them without a soak:

PR	Change	Why it should soak
#670 / #671	fix(agent-status): a waiting reported mid-turn is held until the turn ends	Changes how the activity dot ranks its sources against each other
#672	fix(codex): a visible async question earns the red attention dot	Matches what codex draws on screen, verified against codex 0.162.1's default UI
#673	feat(agent): the working dot breathes in 16 eased steps at 10 Hz	Visual. A working agent's dot now redraws at 10 Hz instead of 4 Hz. Idle is unchanged.
#674	feat(agent-hud): native strip for Antigravity (agy) tabs	A new reader over agy's transcript format

Every open bug issue predates July and none is a regression, so rc.3 is main as it stands.

main stays at 2.2.0-rc.3 through the soak, which runs into next week.

After merge, on main:

1. make release-tag VERSION=2.2.0-rc.3
2. Push the tag. release.yml verifies the archives reproduce, publishes a GitHub pre-release, and dispatches the Homebrew tap and apt. The crates job publishes spyc 2.2.0-rc.3 and skips spyc-vt-sys 0.1.0, which is unchanged.

Checks: make check passes (the pre-commit gate), and the binary reports spyc 2.2.0-rc.3 (<sha>).

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