fix: preserve LESS options in enter pager

[wfxr]

Check list

• I have performed a self-review of my code
• I have commented my code in hard-to-understand areas
• I have added unit tests for my code
• I have made corresponding changes to the documentation

Description

Preserve user-defined LESS options when opening the full-screen Enter pager. Like Git, forgit now honors an existing LESS value rather than replacing it; the required color and stay-open behavior is expressed through command-line options.

Add regression coverage for inherited LESS options and document the default FORGIT_ENTER_PAGER behavior.

Fixes #538.

Type of change

• Bug fix
• New feature
• Refactor
• Breaking change
• Test
• Documentation change
• CI change

Test environment

• Shell
  • bash
  • zsh
  • fish
• OS
  • Linux
  • Mac OS X
  • Windows
  • Others:

Additional verification: lib/bashunit tests (74 tests, 123 assertions), shfmt, Bash syntax check, rumdl, and ShellCheck 0.11.0 with the repository's pre-existing SC2218 findings excluded.

Summary by CodeRabbit

• New Features

  • Added FORGIT_ENTER_PAGER configuration for customizing the pager used when entering interactive views.
  • The default pager now preserves existing LESS settings while preventing automatic exit behavior.

• Documentation

  • Documented the new pager configuration option, its default value, and configuration behavior.

• Tests

  • Added coverage to verify pager environment preservation and interactive behavior.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 13ea6197-a7da-48cd-bbca-975ea62ba9d9

📥 Commits

Reviewing files that changed from the base of the PR and between 15db001 and 7673299.

📒 Files selected for processing (3)

• README.md
• bin/git-forgit
• tests/pager.test.sh

Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review.

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📝 Walkthrough

Walkthrough

The Enter pager now uses explicit less options without resetting LESS. The README documents FORGIT_ENTER_PAGER, and a Bash test verifies the command and environment behavior.

Changes

Pager configuration

Layer / File(s)	Summary
Enter pager behavior and validation bin/git-forgit, README.md, tests/pager.test.sh	The default Enter pager now runs less -R -+F -+E. The documentation describes FORGIT_ENTER_PAGER and its defaults. The test verifies LESS preservation and the explicit pager options.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 76732

This localized change preserves user-defined LESS options while retaining the pager's required behavior, with regression coverage and documentation updates; no actionable merge-blocking risk remains after normal checks and review.

Suggested reviewers: carlfriedrich, cjappl, sandr01d

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the primary change: preserving user-defined LESS options in the Enter pager.
Description check	✅ Passed	The description follows the template, explains the change, lists testing, and identifies the bug fix, test, and documentation updates.
Linked Issues check	✅ Passed	The changes satisfy issue #538 by preserving LESS options and documenting FORGIT_ENTER_PAGER behavior.
Out of Scope Changes check	✅ Passed	The README, pager implementation, and regression tests are directly related to the linked issue and PR objectives.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/preserve-less-options

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