perf: Daily incremental optimization to TypeGo core bridge and event loop

[repyh]

Implemented several micro-optimizations inside the TypeGo core bridge logic:

1. JS Bridge Performance: Optimized iteration inside reflection arrays and maps for Sobek interoperability.
2. Structural Stability: Prevented double execution on WaitGroup completions inside Promises.
3. Cache Lines: Grouped frequently hit mu, running, and autoStop fields together separated from heavier primitives inside EventLoop struct.

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PR created automatically by Jules for task 12838533661778031702 started by @repyh

Summary by CodeRabbit

• Bug Fixes

  • Fixed promise settlement execution to occur exactly once, preventing potential issues that could arise from multiple callback invocations in edge cases.

• Performance Improvements

  • Enhanced byte array conversion efficiency when interfacing with the JavaScript runtime.
  • Optimized performance of map data binding through improved iteration and key formatting logic.
  • Refined event loop promise handling for improved reliability and consistency.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ce1d6ee2-32b1-4659-9300-d0229071b7f8

📥 Commits

Reviewing files that changed from the base of the PR and between ab8fb9a and b50937f.

⛔ Files ignored due to path filters (1)

• go.sum is excluded by !**/*.sum

📒 Files selected for processing (3)

• examples/projects/link-shortener/typego.modules.json
• go.mod
• typego

📝 Walkthrough

Walkthrough

This PR optimizes the JavaScript-Go bridge layer by introducing safe byte array conversion to prevent JS mutation of Go memory, improving reflection binding performance through numeric key formatting, and guarding promise callbacks against double-settlement via sync.Once.

Changes

JS-Go Bridge Performance and Safety

Layer / File(s)	Summary
Byte Array Type Contract bridge/core/arraybuffer.go	ToUint8Array function converts Go []byte to JavaScript Uint8Array backed by ArrayBuffer, with fallback when typed array constructor unavailable.
Reflection Optimization Imports bridge/core/reflection.go	strconv import added to enable optimized numeric type-to-string formatting in reflection binding.
Byte Slice Binding bridge/core/reflection.go	Slice binding copies byte arrays and converts via ToUint8Array to prevent JavaScript mutation of Go memory.
Map Binding Optimization bridge/core/reflection.go	Map iteration switches from MapKeys/MapIndex to MapRange and uses strconv for numeric key string conversion; other types fallback to fmt.Sprint.
Promise Callback Safety eventloop/eventloop.go	CreatePromise callbacks guarded by sync.Once to ensure single JS-thread settlement and WaitGroup.Done() even if both handlers invoked. EventLoop struct fields reorganized with @optimized comments.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~22 minutes

Poem

🐰 Bytes now traverse the bridge so safe,
Once guards the promise, never late,
Reflection blooms with strconv's grace,
Go and JS meet in their place. 🌟

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main objective of the pull request as performance optimization to TypeGo core bridge and event loop components, which matches the changeset in arraybuffer.go, reflection.go, and eventloop.go.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch daily-opt-bridge-core-12838533661778031702

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