fix(proofs): align Idris Lang enum with Rust (Chapel not C) — closes #41

[hyperpolymath]

Summary

Closes #41 — the Rust Language enum and the Idris Lang enum both claimed "49 variants + Unknown" but disagreed on which 49:

Variant	Rust src/types.rs	Idris src/abi/PatternCompleteness.idr
Chapel	✅	❌ (now ✅)
C	❌	✅ (now ❌)

Result: the totality theorem completeScanForAll was technically vacuous for C (no Rust dispatch existed to verify) and silently missing coverage for Chapel.

Fix — Option 1 from the issue

Drop C from Idris, add Chapel. Rationale: Cpp already represents the unified C/C++ analyzer (analyze_c_cpp dispatches on .c / .cpp / .h / .hpp / .cc / .hh), so there was never a separate C constructor in the Rust source of truth — the original Idris enum had a phantom constructor.

Changes

Location	Change
Lang data declaration	Remove C, add Chapel (in new -- HPC / parallel group, mirroring its position in types.rs)
Header comment	Note that Cpp is the C/C++ unified analyzer
analyzerFor	Drop analyzerFor C = SpecificAnalyzer; add analyzerFor Chapel = SpecificAnalyzer
detectorsFor	8 lists updated: [C, Cpp] → [Cpp] (UncheckedAllocation, UnboundedLoop, UnsafeCode, RaceCondition, DeadlockPotential, ResourceLeak, InsecureProtocol, HardcodedSecret, UncheckedError)

Net diff: -11 / +16 lines, single file.

Acceptance criteria (from #41)

• cargo build --release clean
• idris2 --check src/abi/PatternCompleteness.idr — totality OK
• Bijection between the two enumerations:

$ comm -23 /tmp/rust-langs /tmp/idris-langs   # in Rust, not Idris
(empty)
$ comm -13 /tmp/rust-langs /tmp/idris-langs   # in Idris, not Rust
(empty)
50 = 50 — match (49 named + Unknown on both sides)

Why this is the right fix

• The Rust enum is the operational source of truth (it's what analyze_inner() actually dispatches against).
• The Idris file is the mirror that has to follow.
• Cpp analyzer subsumes .c files via the unified analyze_c_cpp path, so there is no behavioural regression.
• Chapel analyzer is now provably covered by completeScanForAll.

Verification

• cargo build --release ✅
• cargo clippy --all-targets --features signing,http -- -D warnings ✅
• idris2 --check (totality) ✅
• Signed commit (GPG)

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 48 issues detected

Severity	Count
🔴 Critical	4
🟠 High	16
🟡 Medium	28

⚠️ Action Required: Critical security issues found!

View findings

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[github-actions]

🔍 Hypatia Security Scan

Findings: 49 issues detected

Severity	Count
🔴 Critical	4
🟠 High	16
🟡 Medium	29

⚠️ Action Required: Critical security issues found!

View findings

[
  {
    "reason": "Action hyperpolymath/standards/.github/workflows/governance-reusable.yml@main needs attention",
    "type": "unpinned_action",
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  {
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]

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