fix: make agent-build.instructions.md visible to agent mode; fix cpp.instructions.md glob whitespace

[Copilot]

Summary

Two small fixes to the GitHub Copilot instruction files:

1. Fix whitespace in cpp.instructions.md applyTo glob

The applyTo front matter had a spurious space before **/*.ino:

# Before
applyTo: "**/*.cpp,**/*.h,**/*.hpp, **/*.ino"

# After
applyTo: "**/*.cpp,**/*.h,**/*.hpp,**/*.ino"

This is now consistent with esp-idf.instructions.md and avoids any risk of parsers failing to match .ino files.

2. Make agent-build-instructions.md visible to agent mode

Renamed .github/agent-build-instructions.md → .github/agent-build.instructions.md and added applyTo: "**" front matter.

GitHub Copilot agent mode automatically includes files named *.instructions.md in .github/ that have a valid applyTo front matter. Without the correct naming convention and front matter, the file was referenced in copilot-instructions.md but not automatically surfaced to the agent.

Updated the link in copilot-instructions.md to point to the new filename.

Summary by CodeRabbit

• Chores
  • Updated internal development and build configuration files.

[softhack007]

LGTM

[softhack007]

@coderabbitai review

[coderabbitai]

✅ Actions performed

Review triggered.

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: c5cb787b-db9a-430c-8eb0-709b3a154b75

📥 Commits

Reviewing files that changed from the base of the PR and between 1fce766 and 2ac9346.

📒 Files selected for processing (3)

• .github/agent-build.instructions.md
• .github/copilot-instructions.md
• .github/cpp.instructions.md

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📝 Walkthrough

Walkthrough

Three GitHub instruction files receive minor configuration and documentation updates. An AI-assistant instruction file gains YAML front matter metadata, a reference link is corrected for naming consistency, and a glob pattern is reformatted by removing whitespace.

Changes

Cohort / File(s)	Summary
GitHub Instruction Files .github/agent-build.instructions.md, .github/copilot-instructions.md, .github/cpp.instructions.md	YAML front matter added to agent-build instructions; documentation link corrected from agent-build-instructions.md to agent-build.instructions.md; whitespace removed from C++ file glob pattern for consistency.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• Revise copilot-instructions.md: consolidate, shorten, and extract language-specific rules, take 2 #353: Related PR that initially added/overhauled the same .github instruction files for AI tool integration.

Suggested reviewers

• netmindz

Poem

🐰 Hops through the .github with glee,
Front matter, links, and spaces to see,
Instructions polished, neat and tight,
For AI companions to do things right! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes both main changes: renaming agent-build-instructions.md with front matter addition and fixing cpp.instructions.md glob whitespace.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch copilot/add-scope-to-ignore-agent-instructions

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