build(antd): size-optimized release profile (strip + thin LTO)

[Nic-dorman]

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What

Adds a size-tuned [profile.release] to antd/Cargo.toml:

[profile.release]
strip = "symbols"
lto = "thin"
codegen-units = 1

Why

The release binary used cargos default release profile (unstripped, codegen-units = 16, no LTO). antd is a single static binary embedding a full P2P client (ant-core/saorsa + QUIC), the EVM payment stack (alloy/evmlib), and both a REST (axum) and gRPC (tonic) server — so there was real, untapped size headroom.

Measured impact (2026-06-09)

Built the same binary with the default profile vs. this profile:

Target	Default	This profile	Δ
Linux (antd-linux-amd64)	36.5 MB	22.1 MB	−37%
Windows (antd-windows-amd64.exe)	29.8 MB	24.6 MB	−17%

strip is the dominant, zero-cost win on Linux (debug symbols the Windows .exe never carried — they live in a separate .pdb). Thin LTO + a single codegen unit add the rest and tend to improve runtime perf. Stripped+LTOd, both platforms converge to ~22–24 MB.

Cost: a slower release link (Linux ~1→4.5 min, Windows ~3→7 min). This is profile.release only — dev/cargo build inner-loop times are unaffected.

Verification

Both optimized binaries were smoke-tested on Linux and Windows: they launch, print --help, and serve a valid /health response ({"status":"ok",...}) while running. No behavior change beyond the binary layout.

🤖 Generated with Claude Code
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[Nic-dorman]

macOS arm64 measurement (2026-06-10)

Built locally on Apple Silicon (M-series) to fill in the gap left by the Linux/Windows numbers in the PR body:

Target	Default	This profile	Δ
macOS arm64 (antd-darwin-arm64)	27.15 MiB	18.34 MiB	−32.5%

For reference alongside the existing table:

Target	Default	This profile	Δ
Linux (antd-linux-amd64)	36.5 MB	22.1 MB	−37%
macOS arm64 (antd-darwin-arm64)	27.15 MiB	18.34 MiB	−32.5%
Windows (antd-windows-amd64.exe)	29.8 MB	24.6 MB	−17%

macOS lands between Linux and Windows — closer to Linux, as expected since Mach-O carries embedded debug symbols that strip = "symbols" removes (Windows .exe files don't, they live in separate .pdbs).

Build-time cost on mac: 1m 53s → 2m 30s (+37s, +33%). Much smaller than the Linux 1m → 4.5m jump noted in the PR — Apple Silicon handles the thin-LTO link cheaply.

Caveat: the comparison was origin/main vs origin/nic/antd-release-size-profile head-to-head, so the lockfiles differ slightly (ant-protocol 2.1.0 → 2.1.2, ant-core 0.2.4 → 0.2.7). The headline result is clearly dominated by strip, but the number isn't perfectly pure. Both binaries verified as Mach-O 64-bit executable arm64.

No CI change needed to capture this — [profile.release] is target-agnostic, so the aarch64-apple-darwin matrix entry in release.yml picks it up automatically on the next tag.