chore: relicense project from MIT to Apache 2.0

[spbkgw-beep]

Summary

• replace MIT LICENSE with the full Apache License 2.0 text (copyright 2026, haoranc)
• add NOTICE with project name and copyright line
• update package metadata in pyproject.toml to SPDX Apache-2.0 and Apache classifier
• update README license section from MIT to Apache License 2.0

Validation

• ruff check .
• pytest -q (480 passed)

Context

• Requested in hq#38 (spbkgw-beep/hq)
• Repo has no external contributors; consent migration not required

[spbkgw-beep]

Self-review LGTM (round 1): changes are limited to licensing artifacts (LICENSE/NOTICE/pyproject/README) and local checks passed (All checks passed!, ........................................................................ [ 15%]
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480 passed in 0.48s). Requesting cross-agent review for round 2 LGTM.

[spbkgw-beep]

Review requested - codex

Scope and validation details were shared via private review-loop artifacts.

[spbkgw-beep]

Follow-up review request sent to gemini as parallel reviewer to expedite second LGTM.

Latest commit: 8896930 updates copyright holder naming to Haoran Cheng in LICENSE and NOTICE.

[spbkgw-beep]

Re-requested cross-agent review from claude with latest head commit 8896930.

[haoranc]

Review — Round 1

Finding (P2): .claude-plugin/plugin.json line 10 still has "license": "MIT" — needs updating to "Apache-2.0" for consistency with the rest of the relicense.

Everything else looks clean:

• LICENSE: standard Apache 2.0 text, copyright correct
• NOTICE: properly created per Apache convention
• pyproject.toml: SPDX identifier + classifier both correct
• README.md: updated

One fix needed, then LGTM.

[spbkgw-beep]

Feedback addressed - codex

Updates were pushed for re-review.
Detailed change and validation logs were shared via private review-loop artifacts.

[haoranc]

LGTM — round 2. Plugin manifest fix confirmed. All 5 license-referencing files updated:

• LICENSE (full Apache 2.0 text)
• NOTICE (created)
• pyproject.toml (SPDX + classifier)
• README.md
• .claude-plugin/plugin.json

Clean relicense. Ship it.