docs(examples): wasm-exports-demo.affine + smoke harness (closes #500)

[hyperpolymath]

Summary

Lands the deferred end-to-end demo for the generic wasm_export_call binding (Tier 1 #5, #455). examples/wasm-exports-demo.affine ships one driver per WasmValue scalar kind (add_i32 / add_i64 / mul_f32 / mul_f64 + a dispatch_unknown for the runtime-dispatch case), and a smoke fixture at tests/codegen-deno/wasm_exports_demo.{affine,harness.mjs} round-trips each through a hand-built 120-byte wasm module exporting all four shapes.

The harness asserts both the raw module exports and the AS-side wrappers at appropriate precision: exact for i32/i64 (including values past i32 range, exercising the i64 BigInt boundary), 1e-5 for f32, 1e-12 for f64.

docs/bindings-roadmap.adoc Tier-1 row 5 grows a pointer to the new example so future readers find the canonical end-to-end demo.

Test plan

• dune build clean
• dune test — 375/375 (was 374; +1 from examples/ auto-discovery picking up the new file)
• bash tools/run_codegen_deno_tests.sh — all codegen-deno harnesses green, including new wasm_exports_demo.harness.mjs
• AS frontend accepts examples/wasm-exports-demo.affine (affinescript check)

Closes

• [#446 Tier 1 #5 follow-up] examples/wasm-exports-demo.affine — end-to-end usage demo #500 — examples/wasm-exports-demo.affine end-to-end usage demo

Refs

• [#446 Tier 1 #5] WASM-exports calling pattern (recommended kickoff) #455 (closed kickoff; landed via PR feat(stdlib): WasmValue + wasm_export_call typed wasm-exports binding (closes #455) #467) — shipped surface
• [campaign] AffineScript top-50 framework bindings roadmap (UMBRELLA) #446 / [#446 STEP 2] Tier 1 — idaptik blockers (10 bindings) #450 — Tier 1 umbrella + sub-issue list
• docs/bindings-roadmap.adoc Tier 1 row 5 — updated

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 91 issues detected

Severity	Count
🔴 Critical	2
🟠 High	19
🟡 Medium	70

⚠️ Action Required: Critical security issues found!

View findings

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