…-SHIP-CPU-004 (#1114)

Adds a "Known Issue (SHIP-007)" callout to README Quick Start that
recommends `--no-gpu` for the canonical 7B Q4K teacher
(paiml/qwen2.5-coder-7b-apache-q4k-v1).

Per SPEC-SHIP-TWO-001 §40 (PR #1111) + apr-cli-model-1-ship-via-cpu-v1.yaml
(PR #1113), the GPU dispatch path on this specific model currently
produces gibberish output ("ampiezza = 1") while the CPU path produces
correct mathematical reasoning ("2 + 2 equals").

This satisfies FALSIFY-MODEL-1-SHIP-CPU-004 (user-facing docs warn
about GPU known-issue):

  $ grep -rE -- '(--no-gpu|SHIP-007|GPU known issue|use --no-gpu)' \
      README.md docs/ apr-cookbook/
  README.md:> **Known Issue (SHIP-007)**: For the canonical 7B Q4K teacher
  README.md:> (paiml/qwen2.5-coder-7b-apache-q4k-v1), use `--no-gpu` until the
  README.md:> apr run paiml/qwen2.5-coder-7b-apache-q4k-v1 "What is 2+2?" --no-gpu

Five-whys (consistent with §40):
1. Why does the README need this warning? Users running `apr run` on the
   canonical 7B Q4K teacher get gibberish without `--no-gpu`.
2. Why? The default GPU dispatch path has SHIP-007 (GPU FP8/dequant defect).
3. Why now? PR #1113 contract requires user-facing docs warning per
   FALSIFY-MODEL-1-SHIP-CPU-004 — this PR satisfies that gate.
4. Why this README placement? Quick Start is the highest-traffic section;
   users see it first.
5. What removes the warning? GPU fix lands → contract bumps to v2.0.0
   → README warning becomes obsolete and gets removed in same PR.

Spec ref: §40.6 Option A (PR #1111).
Contract ref: apr-cli-model-1-ship-via-cpu-v1 (PR #1113).
Coverage: contributes to MODEL-1 SHIP gate completeness.

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Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

…Option A (#1113)

Authors a new provable contract that codifies the SPEC-SHIP-TWO-001 §40.6
Option A shipping decision: MODEL-1 (paiml/qwen2.5-coder-7b-apache-q4k-v1)
IS shippable today via `apr run --no-gpu`.

Live evidence (RTX 4090, lambda-labs):

  $ apr run /mnt/.../qwen2.5-coder-7b-instruct-q4k.apr \
      --prompt "What is 2+2?" --max-tokens 5 --temperature 0 \
      --skip-contract --no-gpu
  Output: "2 + 2 equals"

  ✓ FALSIFY-MODEL-1-SHIP-CPU-001 PASS (contains "equals")

Contract structure:
- 3 equations: cpu_path_correctness (PASSES today), gpu_path_known_issue
  (acknowledges defect tracked in §40), gpu_fix_obligation (durable
  closure mandate).
- 6 falsification tests: -001 CPU correctness, -002 §40 in spec,
  -003 pv validate, -004 user-facing docs warn about GPU, -005 semver
  signals scope, -006 spec→contract back-reference.
- 5 proof_obligations + 2 kani harnesses.
- Contract validates clean via `pv validate` (0 errors, 0 warnings).

Methodology compliance per `feedback_fix_root_cause_never_route_around.md`:

This contract is NOT a workaround. It documents reality (CPU works, GPU
has known bug), creates a falsifiable gate that catches CPU regressions,
and MANDATES that the GPU bug remain visible in the spec until fixed:

- v1.0.0: MODEL-1 ships CPU-only
- v2.0.0: MODEL-1 ships CPU+GPU (requires gpu_path_known_issue closure)
- Closing the GPU bug requires either:
  (a) GPU passes cpu_path_correctness gate
  (b) GPU dispatch is removed/deprecated
  (c) New hypothesis identified + spec amendment

Five-whys (consistent with §40.5):
1. Why isn't MODEL-1 shipped today? Because we lacked a contract-backed
   verdict that "MODEL-1 produces correct output via SOME inference path".
2. Why? Because the §17/§23/§27/§38 chain was bisecting the wrong path,
   leaving the actual CPU correctness un-codified.
3. Why now? §40.4 + §40.5 + #1112 H1+H2 falsifiers narrowed the bug to
   GPU dispatch (H3); CPU is empirically correct.
4. Why this contract NOW? Per the user directive to ship + use contracts;
   MODEL-1 is shippable TODAY with a v1.0.0 SHIP-via-CPU contract.
5. What's next? On gpu_fix_obligation closure (a/b/c), bump v1.0.0 → v2.0.0
   and 5 MODEL-1 PARTIALs auto-discharge.

Spec ref: §40.6 Option A.
PR cascade: #1105/#1107/#1108/#1109/#1110/#1111/#1112 (this is the SHIP
gate that builds on top of §40 localization).

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Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>