migrate(C5): engine coprocessors — Maths + deterministic PRNG, 4-gate green

[hyperpolymath]

C5 — engine coprocessors: Maths + the deterministic PRNG

C5 is the engine-coprocessor layer. 2 integer brains extracted, 9 senses classified.

Random — the strategic one (bit-exact PRNG)

The deterministic xmur3 + mulberry32 PRNG from src/engine/utils/Random.res — the multiplayer-reproducibility backbone. Identical seed → identical stream, bit-for-bit, on every client. Per the brain/senses split, the host iterates the seed string (feeding UTF-16 code units to xmur3_step) and does the final u32 → [0,1) float division; the brain owns only the i32 mixing (6 exports matching the RandomCoprocessor.res bridge surface).

Written around two compiler facts: * == i32.mul == Math.imul; >>> emulated via VmBitwise's lsr; the u32 multiplier constants as their signed-i32 bit patterns (identical under i32.mul). Parity is bit-exact vs the original .res — the oracle re-derives the source with JS-native Math.imul + >>> over the full i32 domain + real UTF-16 code units.

Maths

clamp (integer, swap-if-inverted), lerp_milli (milli-unit blend), dist_sq (squared distance; sqrt stays host-side per the float wall).

Four gates green

Gate	Result
G1 compile	2/2 (WASM)
G2 parity	2108/2108 (Maths 1982 + Random 126 bit-exact)
G3 boundary	n/a (transforms / bit-mixing — no encoding table)
G4 assail	2/2 clean

Senses (classified, not migrated)

5 *Coprocessor FFI bridges · Resize/GetResolution (float + DOM reads) · Audio (Pixi) · Navigation (screen-stack orchestration + async asset load, effect-gated) · WaitFor (timing).

C5 DONE. NEXT: C11 ("pure integer presentation state"). Staged-only under proposals/idaptik/migrated/ — idaptik write-gate honoured.

https://claude.ai/code/session_01WoKhFQePiRsAj7aqnxbG8s

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Generated by Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 87 issues detected

Severity	Count
🔴 Critical	2
🟠 High	15
🟡 Medium	70

⚠️ Action Required: Critical security issues found!

View findings

[
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    "rule_module": "workflow_audit",
    "severity": "medium"
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  {
    "reason": "Action ons/checkout@v6\n    needs attention",
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    "file": "publish-jsr.yml",
    "action": "pin_sha",
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    "severity": "medium"
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  {
    "reason": "Action land/setup-deno@v2\n    needs attention",
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    "file": "publish-jsr.yml",
    "action": "pin_sha",
    "rule_module": "workflow_audit",
    "severity": "medium"
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  {
    "reason": "Issue in affine-vscode-publish.yml",
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    "action": "flag",
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  {
    "reason": "Issue in casket-pages.yml",
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    "action": "flag",
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  {
    "reason": "Issue in casket-pages.yml",
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    "action": "flag",
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  {
    "reason": "Issue in ci.yml",
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    "file": "ci.yml",
    "action": "flag",
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  {
    "reason": "Issue in ci.yml",
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    "file": "ci.yml",
    "action": "flag",
    "rule_module": "workflow_audit",
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  {
    "reason": "Issue in ci.yml",
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    "action": "flag",
    "rule_module": "workflow_audit",
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]

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