docs: write the v0.11.1, v0.12.0 and v0.12.1 changelog entries

[Lutherwaves]

The fixes for placement cycles, IfcFaceBasedSurfaceModel support and the half-space clip shipped as v0.11.1, v0.12.0 and v0.12.1 without writing anything under ## Unreleased. The release workflow therefore promoted three empty headings. This PR fills them in and changes nothing else.

• v0.11.1 (Fixed): a cyclic or self-referencing placement chain no longer overflows the stack. The walk now detects cycles and stops at 1024 levels.
• v0.12.0 (Added): IfcFaceBasedSurfaceModel is tessellated. On duplex_a the box-fallback rate drops from 32.1% to 1.9%.
• v0.12.1 (Fixed): half-space subtypes now reach the clip gate. A bounded clip whose boundary is not a rectangle keeps the conservative box instead of under-reporting.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Improved boolean clipping for polygonal and boxed half-spaces with rectangular boundaries. Other shapes continue to use the existing fallback behavior.

[coderabbitai]

Navigate logical layers of code changes, visualize relationships, and explore their blast radius.

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 277181d4-11d9-4b95-8b6c-05ecbaf44e86

📥 Commits

Reviewing files that changed from the base of the PR and between 02d8bce and 112e2d1.

📒 Files selected for processing (1)

• CHANGELOG.md

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

---

📝 Walkthrough

Walkthrough

The changelog adds a v0.12.1 entry describing bounded clipping for rectangular half-space boundaries, the fallback for other shapes, and related measurements.

Changes

Half-space clipping

Layer / File(s)	Summary
Document clipping behavior CHANGELOG.md	The v0.12.1 entry describes bounded clipping for rectangular half-space boundaries, the conservative bounding-box fallback for other shapes, and corpus measurements.

Priority: ⬇️ Low

Merge Risk: ⚪ Minimal · up to 112e2

The release notes accurately describe the documented changes and their limits; no actionable merge risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the documentation change and names all three changelog entries.
Description check	✅ Passed	The description clearly explains what changed and why. It omits the template headings and does not state how the documentation-only change was verified, but the required context is mostly present.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}