chore: add .envrc so direnv loads .env.local on cd

[andrew-bierman]

Summary

• Adds a one-line .envrc (dotenv_if_exists .env.local) so direnv auto-exports the contents of .env.local whenever you cd into the repo.
• Removes the manual export PACKRAT_NATIVEWIND_UI_GITHUB_TOKEN=... && bun install two-step that configure-deps.ts currently nudges you toward — the token is already in .env.local for runtime, and direnv promotes it into the parent shell before bun reads bunfig.toml.

Why

bunfig.toml resolves \$PACKRAT_NATIVEWIND_UI_GITHUB_TOKEN at bun process startup, before the preinstall hook runs, so the env must be present in the parent shell. .env.local alone can't satisfy that. direnv fills the gap cleanly without per-shell exports.

No secrets

• .envrc itself contains no secrets — just the directive.
• .env.local is already in .gitignore.

Test plan

• direnv allow in the repo root.
• cd out and back in; direnv prints loading ~/Code/PackRat/.envrc and export +PACKRAT_NATIVEWIND_UI_GITHUB_TOKEN.
• bun install succeeds with no manual export.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Updated environment variable loading to conditionally support local configuration overrides.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

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Run ID: 1a6aca20-a5ef-46e9-942b-7a7f7dc54efb

📥 Commits

Reviewing files that changed from the base of the PR and between 12be343 and 04c949a.

📒 Files selected for processing (1)

• .envrc

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Walkthrough

.envrc now conditionally loads .env.local when present, allowing developers to customize environment variables locally without version control tracking.

Changes

Environment Configuration

Layer / File(s)	Summary
dotenv_if_exists directive .envrc	Adds dotenv_if_exists .env.local to load optional local environment overrides, supporting per-developer configuration.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 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 change: adding a .envrc file to enable direnv to automatically load .env.local on directory entry.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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 chore/direnv-envrc

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[Copilot]

Pull request overview

Adds a direnv configuration so repository-local environment variables from .env.local are automatically exported when entering the repo, supporting workflows where tooling needs env vars present at process startup (e.g., Bun config resolution).

Changes:

• Add .envrc with dotenv_if_exists .env.local to load .env.local via direnv on cd.

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