fix: add --isolation alias

[konard]

Fixes #130.

Summary

• Add --isolation and --isolation=<env> as aliases for --isolated in both JavaScript and Rust parsers.
• Reject unknown dash-prefixed wrapper options before they can fall through to direct command execution.
• Update help text, README docs, regression tests, case-study notes, and JS/Rust release metadata.

Reproduction

Before the fix, $ --isolation docker -- echo 'hi' parsed with no isolation request and ran directly. The new parser tests cover that command form plus --isolation=<env>, no-separator parsing, and unknown wrapper option failures.

Tests

• bun test ./test/args-parser-isolation-alias.js
• bun run test
• bun run check
• cargo test --all-features --verbose
• cargo fmt --all -- --check
• cargo clippy --all-targets --all-features
• node scripts/check-file-size.mjs
• node scripts/check-test-parity.mjs
• node scripts/check-doc-examples.mjs
• bash scripts/check-mjs-syntax.sh
• node scripts/validate-changeset.mjs
• HAS_FRAGMENTS=true node scripts/check-release-needed.mjs --working-dir js --registry npm
• HAS_FRAGMENTS=true node scripts/check-release-needed.mjs --working-dir rust --registry crates.io

No screenshots are included because this is CLI parser behavior.

[konard]

Working session summary

Implemented and pushed the fix to PR 131: #131

What changed:

• Added --isolation and --isolation=<env> as aliases for --isolated in both JS and Rust parsers.
• Unknown dash-prefixed wrapper options now fail fast instead of silently falling through to direct command execution.
• Added regression tests, help/README updates, release metadata, and the issue case study under docs/case-studies/issue-130.

Verification:

• Local JS/Rust checks passed, including bun run test, bun run check, cargo test --all-features --verbose, cargo fmt, and cargo clippy.
• GitHub CI is green on commit 57c3fd4: JavaScript CI/CD and Rust CI/CD both completed successfully.
• PR 131 is marked ready for review.
• Working tree is clean.

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[konard]

🤖 Solution Draft Log

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💰 Cost estimation:

• Model: GPT-5.5
• Provider: OpenAI
• Public pricing estimate: $11.374992

📊 Context and tokens usage:

• 267.5K / 1.1M (25%) input tokens, 31.8K / 128K (25%) output tokens

Total: (267.5K + 7.3M cached) input tokens, 31.8K output tokens, $11.374992 cost

🤖 Models used:

• Tool: OpenAI Codex
• Requested: gpt-5.5
• Model: GPT-5.5 (gpt-5.5)

📎 Log file uploaded as Repository (39720KB)

• View complete solution draft log

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[konard]

✅ Ready to merge

This pull request is now ready to be merged:

• All CI checks have passed
• No merge conflicts
• No pending changes

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