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docs: import selected docs from geom smoke branch - #18
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…unity, memorial, legacy notes)
Summary by CodeRabbit
Code Review AnalysisWalkthroughThis pull request adds six documentation files establishing foundational architecture concepts, specifications, and migration guidance for the Echo project. Changes include comparative analysis against Unity, deterministic collision system specifications, phase-1 planning, legacy inventory, development guidelines, and nostalgic project history. Changes
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~22 minutes Areas requiring attention:
Poem
From: Linus Torvalds torvalds@linux-foundation.org Look, I'm not going to pretend documentation is "real work" in the sense that it doesn't need scrutiny. You've dropped six markdown files into the repo, and while it's just docs, you've committed to a ton of architectural narrative that people are going to read and believe. Here's the thing: The Echo vs. Unity comparison is going to be a marketing document. Fine. But make sure the DPO/rewrite-rule narrative holds up under scrutiny. Confluence-based replication is a claim—make sure it's true before shipping this. Phase 1 geom plan has milestones M0 through M7. That's ambitious. Don't miss. Scope creep in geometry/collision is how projects die. The legacy stuff ( Bottom line: The documentation itself is competent and well-structured. The analysis is sound. But you're now bound by these words. Implementation teams will reference this. Doesn't give you permission to half-ass it. Hold yourself accountable. BunBun Pre-merge checks and finishing touches❌ Failed checks (1 warning)
✅ Passed checks (2 passed)
✨ Finishing touches🧪 Generate unit tests (beta)
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Actionable comments posted: 4
📜 Review details
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Review profile: ASSERTIVE
Plan: Pro
📒 Files selected for processing (6)
docs/echo-vs-unity.md(1 hunks)docs/legacy-excavation.md(1 hunks)docs/legacy/original-guidelines.md(1 hunks)docs/memorial.md(1 hunks)docs/phase1-geom-plan.md(1 hunks)docs/spec-geom-collision.md(1 hunks)
🧰 Additional context used
🪛 LanguageTool
docs/legacy/original-guidelines.md
[style] ~7-~7: Consider using a more formal and expressive alternative to ‘awesome’.
Context: ...philosophy 1. Just do it. 2. Tests are awesome. 3. Workflow automation is awesome. 4. ...
(AWESOME)
[style] ~8-~8: Consider using a more formal and expressive alternative to ‘awesome’.
Context: ... are awesome. 3. Workflow automation is awesome. 4. Don't push crazy stuff to `origin m...
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[grammar] ~14-~14: Use a hyphen to join words.
Context: ...1. Don't solve solved problems. Use open source solutions when possible. 2. Be fo...
(QB_NEW_EN_HYPHEN)
[uncategorized] ~71-~71: The official name of this software platform is spelled with a capital “H”.
Context: ...name, like jack, or arthur, or your github alias, if you prefer, like `flyingrobot...
(GITHUB)
[style] ~95-~95: Consider using the internationally preferred transliteration for the capital of Ukraine.
Context: ...altar 7. Hanoi 8. Islamabad 9. Juba 10. Kiev And so on. Yea or nay?
(KIEV)
docs/memorial.md
[style] ~15-~15: Three successive sentences begin with the same word. Consider rewording the sentence or use a thesaurus to find a synonym.
Context: ... the README: your chaos delighted us. To the sandbox directory with a `stub.todo...
(ENGLISH_WORD_REPEAT_BEGINNING_RULE)
[style] ~18-~18: Consider using the internationally preferred transliteration for the capital of Ukraine.
Context: ... that promised capitals from Baghdad to Kiev, the audio-less physics demos, and the ...
(KIEV)
docs/echo-vs-unity.md
[grammar] ~77-~77: Ensure spelling is correct
Context: ...## Authoring & Extensibility - Replace ad‑hoc side effects with explicit rewrite rule...
(QB_NEW_EN_ORTHOGRAPHY_ERROR_IDS_1)
docs/phase1-geom-plan.md
[grammar] ~35-~35: Ensure spelling is correct
Context: ...ps bounded and recorded. - Stable sorts/tie‑breakers by ids; centralized tolerances in one m...
(QB_NEW_EN_ORTHOGRAPHY_ERROR_IDS_1)
🪛 markdownlint-cli2 (0.18.1)
docs/spec-geom-collision.md
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docs/echo-vs-unity.md
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docs/phase1-geom-plan.md
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⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (1)
- GitHub Check: Security Audit
🔇 Additional comments (4)
docs/legacy-excavation.md (1)
1-32: LGTM for structure and content.The legacy excavation table is well-organized, comprehensive, and provides clear migration guidance. No formatting or content issues detected.
docs/phase1-geom-plan.md (1)
1-56: ---
The file already has blank lines before all section headings. The provided code snippet shows each
##heading preceded by a blank line—the very formatting you're requesting already exists. No changes needed.BunBun
Likely an incorrect or invalid review comment.
docs/echo-vs-unity.md (1)
1-114: ---From: Linus Torvalds torvalds@linux-foundation.org
To: {PR_AUTHOR_NAME} <{PR_AUTHOR_EMAIL}>
Cc: code-rabbit@vger.kernel.orgSubject: RE: [PATCH] docs/echo-vs-unity.md — This Review Is Just Plain Wrong
Dismiss this review comment. It's factually incorrect.
Look, I ran verification and the reviewer didn't do their homework. Here's what's actually true:
No trailing space at line 58. The review claims line 58 has trailing spaces. I checked it. It doesn't. The
cat -Aoutput shows the line ending cleanly with$(end-of-line marker), no phantom spaces. This is a false claim.No markdown linting config exists in the repo. The reviewer says "I'm assuming you want setext style" based on
.markdownlint.jsonor similar. Guess what? I searched for every variant of markdown linting config files—none exist. The reviewer invented a standard that doesn't exist. That's not a code review, that's fiction.The file consistently uses atx-style headings, which is completely legitimate Markdown. 11 atx headings (
##,###) vs 1 setext—this is coherent and standard. Nothing wrong with this choice.No markdown linter tool is available to validate claimed violations. Without a config and without the tool, all those "violations" mentioned are just hand-waving. No evidence, no specificity, no substance.
The reviewer explicitly admitted uncertainty ("I'm assuming...") and then doubled down on making you fix something based on that assumption. That's not a review—that's a guess with extra steps.
Your docs/echo-vs-unity.md file is fine. The markdown is clean, the content is solid, the heading style is internally consistent. Ship it.
BunBun
Likely an incorrect or invalid review comment.
docs/spec-geom-collision.md (1)
1-178: ---From: Linus Torvalds torvalds@linux-foundation.org
To: {PR_AUTHOR_NAME}
Cc: code-rabbit@vger.kernel.org
The review comment is factually incorrect about the markdown violation.
Your reviewer diagnosed the issue backwards. The problem is NOT missing blank lines before headings—those are present and consistent throughout the file. The actual violations are:
- Missing blank lines AFTER headings (before list/content):
## Goalsimmediately followed by- Deterministic...with no blank line between.- Missing blank line before code blocks:
## Public Traits (sketch)immediately followed by\``rust` with no blank separator.Compare your file (bad):
## Goals - Deterministic across platforms and runs;Against
echo-vs-unity.md(correct):## One‑Screen Summary - Typed Nodes: ...The reviewer's fix target is inverted. Before you waste time implementing a fix for the wrong problem, they need to clarify which specific lines need blank-line additions and whether it's before code fences, after headings, or both.
Ignore the current direction; request clarification on the exact formatting rule and which lines violate it.
BunBun
Likely an incorrect or invalid review comment.
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| Obviously, replace `jake` with your name, like `jack`, or `arthur`, or your github alias, if you prefer, like `flyingrobots/amazing-thing`. |
There was a problem hiding this comment.
Capitalize GitHub correctly.
Line 71 references "github alias" but GitHub is a proper noun requiring capital letters.
-Obviously, replace `jake` with your name, like `jack`, or `arthur`, or your github alias, if you prefer, like `flyingrobots/amazing-thing`.
+Obviously, replace `jake` with your name, like `jack`, or `arthur`, or your GitHub alias, if you prefer, like `flyingrobots/amazing-thing`.📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| Obviously, replace `jake` with your name, like `jack`, or `arthur`, or your github alias, if you prefer, like `flyingrobots/amazing-thing`. | |
| Obviously, replace `jake` with your name, like `jack`, or `arthur`, or your GitHub alias, if you prefer, like `flyingrobots/amazing-thing`. |
🧰 Tools
🪛 LanguageTool
[uncategorized] ~71-~71: The official name of this software platform is spelled with a capital “H”.
Context: ...name, like jack, or arthur, or your github alias, if you prefer, like `flyingrobot...
(GITHUB)
🤖 Prompt for AI Agents
In docs/legacy/original-guidelines.md around line 71, the text uses the
lowercase term "github alias"; update it to the correct proper noun "GitHub
alias" (replace "github" with "GitHub") so the product name is capitalized
properly.
| 7. Hanoi | ||
| 8. Islamabad | ||
| 9. Juba | ||
| 10. Kiev |
There was a problem hiding this comment.
Update Kiev to Kyiv (modern transliteration).
Line 95 uses the outdated Soviet-era transliteration "Kiev". The modern, officially adopted transliteration is "Kyiv".
-10. Kiev
+10. Kyiv📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| 10. Kiev | |
| 10. Kyiv |
🧰 Tools
🪛 LanguageTool
[style] ~95-~95: Consider using the internationally preferred transliteration for the capital of Ukraine.
Context: ...altar 7. Hanoi 8. Islamabad 9. Juba 10. Kiev And so on. Yea or nay?
(KIEV)
🤖 Prompt for AI Agents
docs/legacy/original-guidelines.md around line 95: the entry "Kiev" uses the
outdated transliteration; replace "Kiev" with the modern, officially adopted
transliteration "Kyiv" so the document uses current place-name spelling.
| To the duplicated submodule config in the README: your chaos delighted us. | ||
| To the sandbox directory with a `stub.todo` file: your silence speaks louder than a 404. | ||
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| We raise a torch to the Athens milestone that never shipped, the roadmap that promised capitals from Baghdad to Kiev, the audio-less physics demos, and the AppleScript that always reopened Chrome to port 1337. You were a fever dream of an ECS, a love letter to boxy sprites, a time capsule of post-jQuery exuberance. |
There was a problem hiding this comment.
Update Kiev to Kyiv (modern transliteration).
Line 18 uses "Kiev" in a list of capitals. Update to the modern transliteration "Kyiv".
-To every `FIXME`, every `TODO`, every `console.log("Sweet.")`: we hear you.
-To the duplicated submodule config in the README: your chaos delighted us.
-To the sandbox directory with a `stub.todo` file: your silence speaks louder than a 404.
+To every `FIXME`, every `TODO`, every `console.log("Sweet.")`: we hear you.
+To the duplicated submodule config in the README: your chaos delighted us.
+To the sandbox directory with a `stub.todo` file: your silence speaks louder than a 404.
-We raise a torch to the Athens milestone that never shipped, the roadmap that promised capitals from Baghdad to Kiev, the audio-less physics demos, and the AppleScript that always reopened Chrome to port 1337.
+We raise a torch to the Athens milestone that never shipped, the roadmap that promised capitals from Baghdad to Kyiv, the audio-less physics demos, and the AppleScript that always reopened Chrome to port 1337.Committable suggestion skipped: line range outside the PR's diff.
🧰 Tools
🪛 LanguageTool
[style] ~18-~18: Consider using the internationally preferred transliteration for the capital of Ukraine.
Context: ... that promised capitals from Baghdad to Kiev, the audio-less physics demos, and the ...
(KIEV)
🤖 Prompt for AI Agents
In docs/memorial.md around line 18, the capital name "Kiev" should be updated to
the modern transliteration "Kyiv"; edit that line to replace "Kiev" with "Kyiv"
(preserve surrounding punctuation and spacing) so the sentence reads with the
corrected spelling.
| ## Public Traits (sketch) | ||
| ```rust | ||
| pub trait BroadPhase { | ||
| fn update(&mut self, tick: TickId, proxies: &[TemporalProxy]); | ||
| fn find_pairs(&self, out: &mut Vec<PotentialPair>); | ||
| } | ||
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| pub trait NarrowPhase { | ||
| fn collide(&mut self, a: &Collider, ta: &TemporalTransform, | ||
| b: &Collider, tb: &TemporalTransform, | ||
| policy: &CcdPolicy) -> ContactOutcome; | ||
| } | ||
| ``` |
There was a problem hiding this comment.
Add blank lines around fenced code block.
Markdown linting requires blank lines before and after fenced code blocks (MD031). Add blank lines before line 77 and after line 89.
pub trait NarrowPhase {
+
```rust
pub trait BroadPhase {
fn update(&mut self, tick: TickId, proxies: &[TemporalProxy]);
fn find_pairs(&self, out: &mut Vec<PotentialPair>);
}
pub trait NarrowPhase {
fn collide(&mut self, a: &Collider, ta: &TemporalTransform,
b: &Collider, tb: &TemporalTransform,
policy: &CcdPolicy) -> ContactOutcome;
}
+```
+🧰 Tools
🪛 markdownlint-cli2 (0.18.1)
77-77: Headings should be surrounded by blank lines
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🤖 Prompt for AI Agents
docs/spec-geom-collision.md lines ~77-89: the fenced code block needs
surrounding blank lines per MD031; add an empty line immediately before the
opening ```rust fence and ensure there is a correctly placed closing ``` fence
followed by a blank line after it (i.e., add a blank line after the closing
fence on line ~89).
… into echo/docs-bonus-from-geom-smoke
1 participant
Cherry-picks a handful of docs from
echo/geom-broad-phase-docs-smokewithout merging the branch wholesale:No runtime code touched; avoids asset/ root files and avoids deleting current specs.