fix(abi): accept runtogether form for multi-cap acronym variants

[hyperpolymath]

Summary

• The Idris2 → Zig name converter only emitted the snake_case form. Cartridges that hand-wrote their Zig FFI with run-together multi-cap acronyms (e.g. `github`, `gitlab`, `rabbitmq`, `dynamodb`) were therefore flagged as Class B drift by abi-verify.
• This PR adds a runtogether candidate (snake with all underscores removed) when it differs from the snake form. The verifier already accepts any candidate, so both styles work side-by-side.

End-to-end results (against boj-server/main)

Cartridge	Before	After
git-mcp	Class B drift (`GitHub → github`, `GitLab → gitlab`)	clean
queues-mcp	Class B drift (`RabbitMQ → rabbitmq`)	clean
aws-mcp	Class B drift (`DynamoDB → dynamodb`)	now reveals a different drift class (variant-extra-in-zig: `sqs_send_message`, `sts_*` not declared in Idris2). Separate fix.

Refs

• Idris2 as source-of-truth: generate/verify Zig FFI from the ABI standards#92 — Phase 2 allowlist expansion
• abi: canonicalise multi-cap Idris2 → Zig name normalisation (GitHub/RabbitMQ/DynamoDB) #18 — Class B name normalisation

Test plan

• 5 new unit tests added; 8 manifest_schema tests pass
• Full `cargo test --release` suite: 46 lib + 9 integration tests pass
• End-to-end against three real cartridges (git-mcp, queues-mcp, aws-mcp)
• CI green on this PR
• Post-merge: rebuild iseriser binary, re-run boj-server abi-drift workflow → Class B count drops to 0

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 19 issues detected

Severity	Count
🔴 Critical	2
🟠 High	5
🟡 Medium	12

⚠️ Action Required: Critical security issues found!

View findings

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    "reason": "Action hyperpolymath/standards/.github/workflows/governance-reusable.yml@main needs attention",
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    "reason": "Action actions/upload-artifact@v4 needs attention",
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  {
    "reason": "expect() in hot path (14 occurrences, CWE-754)",
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  {
    "reason": "expect() in hot path (11 occurrences, CWE-754)",
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