chore(release): v0.9.0 "Threshold"

Version bump 0.8.0 -> 0.9.0 across the workspace (root + 11 crates, including
internal path-dependency version pins) and Cargo.lock regeneration.

Converts CHANGELOG.md's [Unreleased] section to [0.9.0] "Threshold" -
2026-07-10, and corrects a batch of version labels across doc comments and
planning docs (docs/STATUS.md, docs/frontend.md, docs/adr/0006,
to-dos/ROADMAP.md, to-dos/VERSION-PLAN.md, to-dos/phase-7-breadth/,
to-dos/phase-8-reach/) that had prematurely attributed this release's work
(the niche peripherals, T-81-001 PR B, and the SPC7110 ROM-identity finding)
to the already-tagged v0.8.0 -- mirroring the same v0.9.0-labeling lesson
from the prior release, this time caught before tagging rather than after.

Adds a new v0.9.0 "Threshold" rung to to-dos/VERSION-PLAN.md's ladder (not
originally planned -- it closes out Phase 7/8's last residuals before the
v1.0.0 production cut) and a matching CHANGELOG entry.

Full pre-release gate re-verified on this exact tree: fmt clean, clippy
clean (workspace + every feature combination), full workspace test suite
(423 tests) green, the 17-suite --features test-roms ROM-oracle gate green,
no_std build clean, RUSTDOCFLAGS="-D warnings" doc build clean.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: doublegate

CHANGELOG.md

@@ -7,7 +7,18 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 > **RustySNES integrates a cycle-accurate emulation engine.** Modeled after its predecessor `RustyNES`, this emulator is built on a master-clock-precise, lockstep-scheduled core targeting the Mesen2/ares accuracy bar. The entries below document the engine-internal milestones as this core is built and hardened.
 
-## [Unreleased]
+## [0.9.0] "Threshold" - 2026-07-10
+
+Closes out Phase 7's last open exit criterion (niche peripherals) and Phase 8's one remaining
+ticket half (T-81-001 PR B), and resolves the previously carried-forward SPC7110 boot
+investigation — the last loose ends before the `v1.0.0` production push
+(`to-dos/VERSION-PLAN.md`'s `v1.0.0` gate is next: `Board: Send` + desktop UX shell maturity are
+what remain there). `v0.9.0` had never been used before this — earlier drafts once mislabeled a
+different rung with it before it was corrected to `v0.8.0` — so this genuinely picks up right
+after `v0.8.0 "Community"`.
+
+**Oracle/golden suites: all held, no regressions.** The full workspace test suite (including
+`--features test-roms`, 17 suites) is green; no golden hash changed.
 
 ### Added
 

Cargo.lock

@@ -15,7 +15,7 @@ members = [
 ]
 
 [workspace.package]
-version = "0.8.0"
+version = "0.9.0"
 edition = "2024"
 rust-version = "1.96"
 license = "MIT OR Apache-2.0"

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rustysnes-apu"
-version = "0.8.0"
+version = "0.9.0"
 edition.workspace = true
 rust-version.workspace = true
 license.workspace = true
@@ -12,7 +12,7 @@ std = []
 
 [dependencies]
 bitflags = "2"
-rustysnes-savestate = { path = "../rustysnes-savestate", version = "0.8.0" }
+rustysnes-savestate = { path = "../rustysnes-savestate", version = "0.9.0" }
 
 [lints]
 workspace = true

crates/rustysnes-apu/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rustysnes-cart"
-version = "0.8.0"
+version = "0.9.0"
 edition.workspace = true
 rust-version.workspace = true
 license.workspace = true
@@ -13,7 +13,7 @@ std = []
 [dependencies]
 bitflags = "2"
 thiserror = { version = "2", default-features = false }
-rustysnes-savestate = { path = "../rustysnes-savestate", version = "0.8.0" }
+rustysnes-savestate = { path = "../rustysnes-savestate", version = "0.9.0" }
 
 [lints]
 workspace = true

crates/rustysnes-cart/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "rustysnes-cheevos"
 description = "Native-only RetroAchievements (rcheevos) FFI wrapper for RustySNES"
-version = "0.8.0"
+version = "0.9.0"
 edition.workspace = true
 rust-version.workspace = true
 license.workspace = true

crates/rustysnes-cheevos/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rustysnes-core"
-version = "0.8.0"
+version = "0.9.0"
 edition.workspace = true
 rust-version.workspace = true
 license.workspace = true
@@ -15,11 +15,11 @@ std = []
 debug-hooks = []
 
 [dependencies]
-rustysnes-cpu = { path = "../rustysnes-cpu", version = "0.8.0", default-features = false }
-rustysnes-ppu = { path = "../rustysnes-ppu", version = "0.8.0", default-features = false }
-rustysnes-apu = { path = "../rustysnes-apu", version = "0.8.0", default-features = false }
-rustysnes-cart = { path = "../rustysnes-cart", version = "0.8.0", default-features = false }
-rustysnes-savestate = { path = "../rustysnes-savestate", version = "0.8.0" }
+rustysnes-cpu = { path = "../rustysnes-cpu", version = "0.9.0", default-features = false }
+rustysnes-ppu = { path = "../rustysnes-ppu", version = "0.9.0", default-features = false }
+rustysnes-apu = { path = "../rustysnes-apu", version = "0.9.0", default-features = false }
+rustysnes-cart = { path = "../rustysnes-cart", version = "0.9.0", default-features = false }
+rustysnes-savestate = { path = "../rustysnes-savestate", version = "0.9.0" }
 thiserror = { version = "2", default-features = false }
 # ROM-identity hashing for TAS movies (`movie.rs`) — already resolved transitively (via `zip` in
 # the frontend), so this promotes an existing dependency to direct rather than adding a new one

crates/rustysnes-core/Cargo.toml

@@ -203,7 +203,7 @@ pub struct Bus {
     /// Controller shift latches (`$4016/$4017`) + the auto-read result (`$4218-$421F`).
     joypad: [u16; 2],
     joypad_strobe: bool,
-    /// Per-port peripheral state (`v0.8.0`, Phase 7 niche peripherals) — Mouse/Super Scope/Super
+    /// Per-port peripheral state (`v0.9.0`, Phase 7 niche peripherals) — Mouse/Super Scope/Super
     /// Multitap. Idle (and touching nothing on `$4016`/`$4017`'s `data1` bit) unless a port's
     /// [`crate::controller::PortDevice`] is explicitly switched away from the default `Gamepad`
     /// via [`Self::set_port_device`], in which case `joypad[port]`'s own bit is bypassed instead
@@ -339,7 +339,7 @@ impl Bus {
     }
 
     /// The peripheral currently connected to controller port `port` — for the debugger overlay
-    /// and the frontend's own input-routing (`v0.8.0`).
+    /// and the frontend's own input-routing (`v0.9.0`).
     #[must_use]
     pub fn port_device(&self, port: usize) -> PortDevice {
         self.ports
@@ -423,7 +423,7 @@ impl Bus {
     }
 
     /// Non-intrusive read of an arbitrary 24-bit CPU address, for the debugger overlay's
-    /// disassembly view (`v0.8.0`, T-81-001 PR B). Unlike [`CpuBus::read24`], this does NOT touch
+    /// disassembly view (`v0.9.0`, T-81-001 PR B). Unlike [`CpuBus::read24`], this does NOT touch
     /// the open-bus latch, does NOT check watchpoints, and does NOT trigger any I/O register's own
     /// read side effect (VRAM/CGRAM auto-increment, NMI-flag-clear-on-read, the H/V-counter
     /// latch, …) — genuinely just peeking. Real 65C816 code only ever executes from WRAM or cart
@@ -551,7 +551,7 @@ impl Bus {
                     }
                 }
             }
-            // Super Scope beam-position auto-latch (`v0.8.0`) — gated to the one sub-tick that
+            // Super Scope beam-position auto-latch (`v0.9.0`) — gated to the one sub-tick that
             // actually advanced the dot, same granularity `dot_ticked` already gives the HDMA
             // check above; a no-op unless port 2 has a Super Scope attached (`Self`'s own doc).
             if dot_ticked {
@@ -778,7 +778,7 @@ impl Bus {
         self.pio = val;
     }
 
-    /// Per-master-clock Super Scope beam-detection check (`v0.8.0`) — a no-op, one cheap branch,
+    /// Per-master-clock Super Scope beam-detection check (`v0.9.0`) — a no-op, one cheap branch,
     /// unless port 2 actually has a Super Scope attached (real hardware: only port 2's IOBIT pin
     /// reaches the PPU latch, `Self::set_pio`). Mirrors ares' `SuperScope::main()`: strobe the
     /// IOBIT pin low-then-high the instant the beam crosses the target dot on the target

crates/rustysnes-core/src/bus.rs

@@ -1,5 +1,5 @@
 //! SNES controller-port peripherals beyond the standard gamepad: Mouse, Super Scope, and Super
-//! Multitap (`v0.8.0`, Phase 7's "niche peripherals" exit criterion).
+//! Multitap (`v0.9.0`, Phase 7's "niche peripherals" exit criterion).
 //!
 //! Ported from ares' `sfc/controller/{mouse,super-scope,super-multitap}` — real hardware's
 //! 2-bit-per-clock (`data1`/`data2`) serial-shift-register protocol per controller port, selected

crates/rustysnes-core/src/controller.rs

@@ -34,7 +34,7 @@ use crate::sa1_bus::Sa1Bus;
 /// savestate-v1-gilyon.bin` fixture), not silent misinterpretation. See
 /// `docs/adr/0006-save-state-format.md`'s bump log for the full record.
 ///
-/// `3` (`v0.8.0`, Phase 7 niche peripherals): `crate::bus`'s `BUS0` section grew — a new WRIO
+/// `3` (`v0.9.0`, Phase 7 niche peripherals): `crate::bus`'s `BUS0` section grew — a new WRIO
 /// (`$4201`/`$4213`) `pio` byte plus each controller port's [`crate::controller::PortState`]
 /// (device selection + Mouse/Super Scope/Super Multitap runtime state). Same guarantee as the `2`
 /// bump above: a `FORMAT_VERSION < 3` blob fails loudly (a `BUS0` section-length mismatch), not