[javimosch]

Summary

• gemm_f32 + attn_causal_fwd/bwd_f32, rmsnorm_fwd/bwd_f32, silu_mul(_bwd)_f32, softmax_xent_f32 — multithreaded CPU kernels for transformer training (MTLM training kernels: gemm_f32 + attention/rmsnorm/silu/softmax builtins #657)
• OpenCL GPU backend ported to Linux with device-resident chaining; GPU-dispatched conv2d_f32, tiled matmul, group_norm(_silu)_f32, attention_f32, silu_f32, geglu_f32, CHW helpers (rode in on MTLM training kernels: gemm_f32 + attention/rmsnorm/silu/softmax builtins #657's stacked base)
• bytes deep-copied across channel sends and go calls — the dangling-arena fix MTLM's tokenizer hit (bytes sent over a channel (or passed to a goroutine) is not deep-copied: data pointer dangles into the sender's arena #658, fix: bytes over channels / go calls is deep-copied (#658) #659)
• Arena growth tripwire: one stderr line when a root arena passes MFL_ARENA_WARN_MB outside an arena {} block (A goroutine's per-iteration temporaries accumulate until it exits: silent 19 GB OOM (needs a diagnostic, not a crash) #660, runtime: arena growth tripwire + honest memory gotcha (#660) #661)
• eprint / eprintln — stderr printing, mirrored in the self-hosted compiler (No stderr print builtin; write_file("/dev/stderr") truncates a redirected stderr (lost two 2-hour training logs) #662, feat: eprint / eprintln — print to stderr (#662) #663)
• Logo in README and docs site (logo in README and docs site #664)
• Version bumps: README badge, machinVersion, SPEC.md, selfhost/server.mfl; CHANGELOG reorganized — the entries that had accumulated inside the already-shipped v0.138.0 section moved to v0.139.0.

Test plan

• CI test gate (includes selfhost prelude/oracle/fixpoint)
• Tag after merge: git tag -a v0.139.0 -m "MFL v0.139.0" && git push origin v0.139.0

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📥 Commits

Reviewing files that changed from the base of the PR and between 931f1e2 and 86a6298.

📒 Files selected for processing (5)

• CHANGELOG.md
• README.md
• SPEC.md
• guide.go
• selfhost/server.mfl

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