chore: Extract '.gemini' to GEMINI_DIR constant

[terrydkim]

Fixes #7414

TLDR

Eliminates all duplicate .gemini directory definitions across the codebase by consolidating to a single source: GEMINI_DIR from packages/core/src/utils/paths.ts.

What changed:

• Removed aliases: SETTINGS_DIRECTORY_NAME, GEMINI_CONFIG_DIR
• Replaced hardcoded '.gemini' strings with GEMINI_DIR import

Dive Deeper

1. Urgency: Without this consolidation, new code will continue introducing hardcoded .gemini strings and creating new aliases, making the technical debt worse. This PR establishes the pattern going forward.

2. Files affected:

   • Scripts: telemetry, build utilities
   • Core: storage utilities, path handling
   • CLI: MCP configuration, shell history
   • Tests: mock definitions across both packages

3. Zero functional changes - pure refactoring for maintainability.

Reviewer Test Plan

Run full test suite: npm test — all green on macOS

Testing Matrix

	🍏	🪟	🐧
npm run	✅	❓	❓
npx	❓	❓	❓
Docker	❓	❓	❓
Podman	❓	-	-
Seatbelt	❓	-	-

(Tested on macOS with npm run - all tests pass)

Linked issues / bugs

Fixes #7414

[gemini-code-assist]

Summary of Changes

Hello @terrydkim, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request is a significant refactoring effort aimed at enhancing the maintainability and consistency of the codebase. It centralizes the definition of the .gemini configuration directory into a single, reusable constant. By replacing hardcoded strings and disparate aliases with a unified GEMINI_DIR constant, the change prevents future technical debt and simplifies path management across various components, including core utilities, CLI configurations, and test setups. The refactoring ensures that all parts of the application refer to the .gemini directory in a standardized manner, without altering any existing functionality.

Highlights

• Centralized '.gemini' directory definition: All instances of the '.gemini' directory name across the codebase have been consolidated into a single GEMINI_DIR constant, imported from packages/core/src/utils/paths.ts.
• Removed duplicate aliases: Existing aliases such as SETTINGS_DIRECTORY_NAME and GEMINI_CONFIG_DIR have been eliminated, streamlining directory path management.
• Pure refactoring: This pull request introduces zero functional changes, focusing solely on improving code maintainability and establishing a consistent pattern for future development.

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[gemini-code-assist]

Code Review

This pull request effectively consolidates all definitions of the '.gemini' directory into a single GEMINI_DIR constant, sourced from packages/core/src/utils/paths.ts. The refactoring is thorough, touching application logic, test files, and utility scripts, which successfully eliminates duplicate definitions and hardcoded strings. This is a valuable improvement for code maintainability. After a detailed review of all changes, I found them to be correct and consistent with the stated goal. There are no high or critical issues to report.

[richieforeman]

Thanks Terry! Appreciate your assistance in our quest to pay down some technical debt :). This is really appreciated.

LGTM!