Renderd v0.7.0-host

Milestone 3 in progress: Core Data Structures & Utilities
(renderd-frame, renderd-clock, renderd-abr).

• Added 16-byte fixed binary fragment header codec (FragmentHeader) in renderd-frame
  crate per RFC-0002 §12.1. (#23)
• Added type-safe fragment header bitfield flags (FragmentFlags) in renderd-frame
  crate. (#24)
• Added fragment header validation logic (ValidateHeader trait) in renderd-frame
  crate. (#25)
• Added sliding-window fragment reassembly buffer state machine (ReassemblyBuffer) in
  renderd-frame crate per RFC-0002 §12.2. (#26)
• Added property-based tests for fragment header codec and reassembly buffer in
  renderd-frame crate. (#27)
• Added high-resolution monotonic clock instant wrapper (MonoInstant) in
  renderd-clock crate per RFC-0002 §13.1. (#28)
• Added 4-timestamp NTP/PTP monotonic clock epoch estimator (ClockEpochEstimator) in
  renderd-clock crate per RFC-0002 §13.2. (#29)
• Added stack-allocated rolling statistics ring buffer (RollingStats) in renderd-clock
  crate per RFC-0002 §13.3. (#30)
• Added integration test suite for clock offset estimation and rolling statistics in
  renderd-clock crate. (#31)
• Added ABR state machine enum (AbrState) in renderd-abr crate per RFC-0002 §14.1.
  (#32)
• Added ABR decision engine (AbrEngine) calculating target bitrates per RFC-0002 §14.2.
  (#33)
• Added ABR telemetry report converter (TelemetryReport) processing PeriodicStats and
  ReactiveStats in renderd-abr crate per RFC-0002 §14.3. (#34)
• Added ABR unit and property-based test suite in renderd-abr crate. (#35)

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Milestone 2 complete: Foundation Layer.

• Added Protobuf protocol schema definition in proto/renderd.proto per RFC-0002 §11.
  (#13)
• Added tools/proto-gen code generator and generated prost Rust types in
  renderd-proto crate. (#14)
• Added protocol domain newtypes (FrameId, FragmentId, BitrateKbps,
  VsyncPeriodNs, ViewerId, HostId) in renderd-proto crate. (#15)
• Added envelope dispatch helpers (MessageKind) and message validation logic for
  SessionHello and SessionConfig in renderd-proto crate. (#16)
• Enabled proto freshness CI check step in .github/workflows/ci.yml. (#17)
• Added configuration schema structs (RenderdConfig, HostConfig, ViewerConfig,
  NetworkConfig, CryptoConfig, AbrConfig) in renderd-config crate. (#18)
• Added Figment-based layered config loader (ConfigBuilder) supporting defaults, TOML
  files, environment variables, and CLI overrides in renderd-config crate. (#19)
• Added configuration validation rules (ValidateConfig trait) for RenderdConfig in
  renderd-config crate. (#20)
• Added ConfigError enum hierarchy (FileNotFound, ParseError, ValidationError)
  and Display implementations in renderd-config crate. (#21)
• Added canonical host and viewer default configuration templates
  (renderd-host.default.toml, renderd-viewer.default.toml) and template validation
  integration tests. (#22)

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Milestone 1 complete: Repository Bootstrap & Infrastructure.

• Initialized Cargo workspace root with resolver v2 and declared all 15 member crates
  across 5 DAG layers (crates/renderd-*, tools/latency-bench, tools/proto-gen)
  per REPO-0001. (#1)
• Added rust-toolchain.toml pinning Rust stable channel (MSRV 1.80) with
  aarch64-apple-darwin, x86_64-pc-windows-msvc, and aarch64-pc-windows-msvc
  target support. (#1)
• Configured workspace-level dependency versions, lint policies, and build profiles
  (dev, release, bench). (#1)
• Configured workspace-level clippy.toml setting msrv = "1.80", disallowing
  std::process::exit and std::env::var, and restricting raw array pair-tokens.
  (#2)
• Added per-crate lint overrides: unsafe_code = "deny" for non-FFI crates;
  unsafe_code = "warn" for FFI crates (renderd-vt-sys, renderd-sc-sys) per
  REPO-0001 §9. (#2)
• Added root .rustfmt.toml workspace formatting configuration per REPO-0001 §10.
  (#3)
• Configured cargo-deny policy in deny.toml for license checking, dependency bans,
  and security advisory checking per REPO-0001 §9. (#4)
• Added test runner configuration in nextest.toml per REPO-0001 §14.7. (#5)
• Added primary CI workflow in .github/workflows/ci.yml per REPO-0001 §18.1. (#6)
• Added security audit workflow in .github/workflows/security.yml per
  REPO-0001 §18.2. (#7)
• Added nightly benchmark workflow in .github/workflows/bench.yml per
  REPO-0001 §18.3. (#8)
• Added code ownership rules in .github/CODEOWNERS per REPO-0001 §7.1. (#9)
• Added PR template and GitHub Issue forms for bug reports, latency regressions, and
  feature requests. (#10)
• Added spell-checking configuration in _typos.toml and
  .github/workflows/typos.yml. (#11)
• Added documentation deployment workflow in .github/workflows/docs.yml per
  REPO-0001 §18.5. (#12)

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