feat: edit tools descriptions tweaks and read real path

[RomneyDa]

Description

A close reading of the edit tools' descriptions warranted several updates. This PR cleans up the edit tools' descriptions

• Unifies between CLI and extensions where possible
• Emphasizes reading the file before usage
• Emphasizes that old_string must be different than new_string
• Removes nonsensical blurbs about line numbers from read file output
• Removes tons of unnecessary new lines
• Uses code references to the read file tool names to reduce tech debt if tool names are changed
• Rearranges sensibly and reduces redundancy unless the redundancy is of critical reminders for proper tool usage

Also, updates read tool and edit tool reads to use fs.realpathSync to reduce false positives on the has file been read funcitonality

Note diff is a bit mangled in descriptions but generally didn't remove much, just enhanced. Most of the removed lines in this PR are just whitespace

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Summary by cubic

Unifies and simplifies the Edit, MultiEdit, and SingleFindAndReplace tool prompts across core and CLI to reduce failed edits and make behavior consistent. Emphasizes “read before edit,” atomic multi-edits, exact whitespace matching, and clear replace_all guidance.

• Refactors
  • Standardized tool descriptions with clear requirements, warnings, and examples (read before edit, exact whitespace, replace_all usage, no parallel calls).
  • Made MultiEdit descriptions reference the single-edit tool they build on (core: SingleFindAndReplace; CLI: Edit).
  • Clarified parameters and path expectations (CLI: absolute paths; core: workspace-relative).
  • Moved read tracking to readFile.ts (readFilesSet/markFileAsRead) and updated imports/tests.
  • Tightened new-file guidance and multi-edit atomicity; improved error messages.

[cubic-dev-ai]

4 issues found across 8 files

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[sestinj]

🎉 This PR is included in version 1.13.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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