fix(stdlib): option.affine — final STAGE-A file, stdlib 19/19 (#128)

[hyperpolymath]

Last failing stdlib/*.affine. With this, every stdlib module type-checks (19/19).

• take/get_or_insert: Rust-style &mut Option<T> → AffineScript mut opt: Option<T> (grammar has no &mut; ownership-prefix is the convention)

• drop prelude map import (option defines its own Option map; prelude's is the list map — same name-conflict class as fix(stdlib): collections.affine prelude arg-order + let mut (#128) #191)

• transpose/map_filter: rewrite list-map via the file's own for-loop ++ idiom (the shadowed map was Option-map)

• cat_options: Unit statement-block arm so it matches None => {} (a bare assignment expr is typed as its RHS → Array vs Unit; collect already works via its Never arm)

• collect/cat_options: reassigned values → let mut

• stdlib 18 → 19/19 — STAGE A coherence complete

• dune test 233/233, zero regression

Refs #128

[github-actions]

🔍 Hypatia Security Scan

Findings: 44 issues detected

Severity	Count
🔴 Critical	12
🟠 High	21
🟡 Medium	11

⚠️ Action Required: Critical security issues found!

View findings

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  {
    "reason": "Superseded by 0-AI-MANIFEST.a2ml",
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    "file": "AI.djot",
    "action": "delete",
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  {
    "reason": "Action hyperpolymath/standards/.github/workflows/governance-reusable.yml@main needs attention",
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    "file": "/home/runner/work/affinescript/affinescript/affinescript-deno-test/lib/compile.ts",
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