test(borrow): #225 PR3b — affine-capture obligation discharged by composition

[hyperpolymath]

#225 PR 3b — affine-capture obligation discharged by composition

ADR-013 obligation 1 (a linear/owned local captured into the continuation env is consumed exactly once; double-resumption impossible) requires no transform-aware static machinery. Discharged by composition:

• (a) the borrow checker runs on the straight-line AST before the codegen CPS transform (verified pipeline order in bin/main.ml) — a double consume of an owned local across the async let is rejected there, exactly as in any synchronous body;
• (b) the PR2 once-resumption trap guarantees the continuation runs at most once, so the transformed code performs each consume the same number of times the checker already verified.

This PR pins (a) with two regressions in test_effects.ml (new frontend_borrow = parse→resolve→typecheck→Borrow.check_program):

• owned local captured across the async split + consumed twice ⇒ use-after-move, rejected by the existing checker (no new rule);
• same shape consumed once ⇒ accepted (rule not over-rejecting the captured-once case the transform relies on).

No compiler/codegen change — test-only + in-code rationale (the PR3a recogniser docstring already states the argument). dune test --force 260 (was 258, +2); tools/run_codegen_wasm_tests.sh green (unaffected, confirmed).

Slice 2 of former PR3. Refs #225 #160 (NOT Closes — joint-close is the final #225 PR).

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 44 issues detected

Severity	Count
🔴 Critical	12
🟠 High	21
🟡 Medium	11

⚠️ Action Required: Critical security issues found!

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