docs: make benchmark results understandable at a glance

[0monish]

Turns the benchmark README into a public-facing evidence summary without changing any benchmark data.

• leads with the strongest current signals: paired KELD-vs-Tauri host memory, KELD-vs-Electron main-process RSS, and Windows host executable size
• explains the current host-size result precisely: 484,864 B for KELD vs 8,634,880 B for Tauri (~94.4% smaller by bytes; Tauri is ~17.8x as large)
• explains in plain English what each metric actually represents
• adds a broader same-machine Windows main-process RSS context table for KELD, Neutralino, Tauri, Wails, Electron, and NW.js
• keeps first-paint and total-RSS non-wins visible
• explicitly labels the numbers as initial, metric-specific evidence rather than an overall framework ranking

Raw results, detailed measurements, and the harness contract remain the source of truth.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 53a96d95-2617-40f5-9ff1-9d3353f9a239

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Reviewing files that changed from the base of the PR and between 3e033fe and c2c899d.

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• README.md

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📝 Walkthrough

Walkthrough

The README adds evidence-backed Keld benchmark comparisons for selected Windows metrics. It also documents limits for framework-wide, Linux startup, cross-session, and cross-lane claims.

Changes

Benchmark documentation

Layer / File(s)	Summary
Evidence-backed advantages section README.md	Documents metric-specific Windows comparisons for memory, first paint, RSS, executable size, and host size. It also records scope qualifications and matching-session and matching-lane requirements.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to c2c89

This PR adds scoped benchmark documentation without changing runtime behavior or benchmark data, so it is mergeable with normal documentation checks.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the README documentation change. It matches the objective of making benchmark results easier to understand at a glance.

✨ Finishing Touches

🧪 Generate unit tests (beta)

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