Document why PR #108 cannot merge into /next (already merged via b711b3d)

[Copilot]

PR #108 (feature/blender-b00t-stack) was already merged into /next on Nov 16, 2025 via commit b711b3d using temporary branch tmp-pr-108. Git reports "Already up to date" when attempting to merge because all 6 commits are present in /next's history.

Evidence

Merge base equals PR HEAD:

$ git merge-base origin/next origin/feature/blender-b00t-stack
7eca7fefda1cc3f403d3c3951ab77db07166d67f  # <- PR HEAD itself

Existing merge commit:

b711b3d49835072eb50cfc24a1083a7e7fa025e9
Author: github-actions[bot]
Date: Sun Nov 16 10:07:19 2025 +0000
Message: Merge branch 'tmp-pr-108' into next

No missing commits:

$ git log origin/feature/blender-b00t-stack --not origin/next
# (empty)

Files Added

• PR_108_SUMMARY.md - Quick reference with key facts and timeline
• PR_108_INVESTIGATION_REPORT.md - Full analysis with git graph visualization, merge base proof, and verification tests

Recommendation

Close PR #108 as already merged, referencing commit b711b3d in /next.

Original prompt

research and explain why pull #108 can't pass (why can't it merge into /next);

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[Copilot]

Pull request overview

This PR adds comprehensive documentation explaining why PR #108 (feature/blender-b00t-stack) cannot be merged into the next branch - the PR was already merged on November 16, 2025 via commit b711b3d using a temporary branch tmp-pr-108.

• Documents the investigation findings with git merge-base analysis proving all 6 commits are already in next
• Provides quick reference summary and detailed investigation report with git graph visualizations
• Includes timeline, verification tests, and recommended actions (close PR as already merged)

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
PR_108_SUMMARY.md	Quick reference document with key facts, evidence (merge commit, merge base analysis), and recommended action to close PR #108
PR_108_INVESTIGATION_REPORT.md	Detailed technical investigation with git graph visualization, timeline, root cause analysis, and verification tests proving the merge occurred

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[Copilot]

[nitpick] The ASCII art diagram uses pipe characters (|) which may render incorrectly depending on the viewer and font. The alignment of the branching structure could break in proportional fonts. Consider using a proper mermaid diagram or a clearer text-based representation for better maintainability and consistent rendering.

Suggested change

	```
	Timeline: October 24, 2025 → November 16, 2025 → Current Investigation
	PR Created PR Merged (Latest Status)
	main branch:
	c209d0f ──────────────────────────────────────> (continues...)
	└─ (PR #108 base)
	feature/blender-b00t-stack (PR #108):
	c209d0f ─→ 469a077 ─→ 308ecfc ─→ fe6a8f6 ─→ 8d64171 ─→ 966e3d6 ─→ 7eca7fe
	↑
	PR HEAD
	next branch:
	... ─→ a13b330 ─┬─→ b711b3d ─→ fe220bb ─→ ... ─→ 159a2c3
	│ ↑ ↑
	│ Merge PR #108 Current HEAD
	│ (Nov 16)
	│
	└──→ (via tmp-pr-108 branch)
	7eca7fe (same as PR head)
	Merge Attempt Result:
	git merge-base next feature/blender-b00t-stack = 7eca7fe
	The merge base IS the PR head itself!
	This mathematically proves the PR is fully merged.
	```
	```mermaid
	%% Timeline: October 24, 2025 → November 16, 2025 → Current Investigation
	%% PR Created PR Merged (Latest Status)
	%% Commit nodes
	graph TD
	subgraph main branch
	M1[c209d0f (PR #108 base)]
	M2[(continues...)]
	M1 --> M2
	end
	subgraph feature/blender-b00t-stack (PR #108)
	F1[c209d0f]
	F2[469a077]
	F3[308ecfc]
	F4[fe6a8f6]
	F5[8d64171]
	F6[966e3d6]
	F7[7eca7fe (PR HEAD)]
	F1 --> F2 --> F3 --> F4 --> F5 --> F6 --> F7
	end
	subgraph next branch
	N1[(...)]
	N2[a13b330]
	N3[b711b3d (Merge PR #108)]
	N4[fe220bb]
	N5[(...)]
	N6[159a2c3 (Current HEAD)]
	N1 --> N2 --> N3 --> N4 --> N5 --> N6
	end
	%% Merge from feature branch to next via tmp-pr-108
	N3 -.-> TMP[tmp-pr-108]
	TMP --> F7
	%% Show that b711b3d merges 7eca7fe (PR HEAD)
	N3 --> F7

Merge Attempt Result:

git merge-base next feature/blender-b00t-stack = 7eca7fe

The merge base IS the PR head itself!
This mathematically proves the PR is fully merged.