Correct project license to The Unlicense

[konard]

Summary

• Changed the crate, README badge/license section, root license file, and tracked testapp metadata to The Unlicense.
• Replaced the previous MIT/Apache license files with canonical Unlicense text and bumped the package version to 0.1.2 for the release workflow.
• Added tests/license_metadata.rs so maintained license metadata fails fast if old markers return.
• Added the issue-7 case study with raw issue/PR evidence, SPDX/npm reference material, and local verification logs under docs/case-studies/issue-7/.

Reproduction

Before this fix, the repository still declared and shipped MIT OR Apache-2.0 in Cargo.toml, README, root license files, testapp/package.json, and testapp/package-lock.json. The new cargo test --locked --test license_metadata --target "$(rustc -vV | sed -n 's/^host: //p')" check would fail on those old markers.

Verification

• cargo fmt --all -- --check
• cargo check --locked --tests --all-features
• cargo test --locked --lib --target "$(rustc -vV | sed -n 's/^host: //p')"
• cargo test --locked --test license_metadata --target "$(rustc -vV | sed -n 's/^host: //p')"
• cargo clippy --locked --tests --all-features -- -D warnings
• wasm-pack build --release --target bundler --out-dir pkg
• wasm-pack test --node
• npm pack --dry-run from pkg/

The generated npm package was confirmed as doublets-web@0.1.2 with license: Unlicense, and the dry-run tarball contains a single LICENSE file.

Fixes #7

[konard]

Working session summary

Implemented and pushed the fix to PR 8: #8

Changed project licensing to Unlicense across Cargo metadata, README, root/testapp license files, and testapp package metadata. Bumped the package to 0.1.2, added tests/license_metadata.rs, and added the issue-7 case study with evidence and verification logs under docs/case-studies/issue-7/.

Local checks passed, including fmt, cargo check, host tests, license metadata test, clippy, wasm-pack build, wasm-pack test --node, and npm pack --dry-run. Fresh CI for commit f8ac49c is green: Ubuntu/macOS/Windows verify and npm package build/test passed; publish was skipped as expected for a PR. Working tree is clean.

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[konard]

🤖 Solution Draft Log

This log file contains the complete execution trace of the AI solution draft process.

💰 Cost estimation:

• Model: GPT-5.5
• Provider: OpenAI
• Public pricing estimate: $7.664085

📊 Context and tokens usage:

• peak request: 5.6M / 1.1M (536%) input tokens, 15.8K / 128K (12%) output tokens

Total: (147.0K + 5.5M cached) input tokens, 15.8K output tokens, $7.664085 cost

🤖 Models used:

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

📎 Log file uploaded as Gist (12644KB)

• 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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