[chore] Organize work-tmp with per-feature subdirectories for agent output

[sfc-gh-lwilby]

Describe your changes

Introduces a work-tmp/features/<feature-name>/ convention for organizing per-feature working files instead of dumping everything flat into work-tmp/.

Right now work-tmp/ is a flat bucket mixing debug logs, implementation plans, test scripts, and throwaway scratch files. This gives feature work its own organized space with a suggested internal structure.

• Per-feature subdirectories: work-tmp/features/<feature-name>/ with implementation-plan.md, notes.md, test-apps/
• Claude Code plansDirectory moved to work-tmp/plans/ to separate auto-generated session plans from feature working files
• One-off throwaway files can still go directly in work-tmp/

Working files accumulated during feature development often have a longer lifespan than truly temporary files — they're useful as context while the feature is in progress and could feed into implementation plans, tech specs, or other longer-lived documentation. This is a first step toward giving work-tmp/ more structure; further organization (e.g. separating scratch files from feature work) could follow.

Screenshot or video (only for visual changes)

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GitHub Issue Link (if applicable)

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Testing Plan

• Explanation of why no additional tests are needed: documentation/configuration-only change, no behavior modifications.

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[Copilot]

Pull request overview

Introduces a clearer convention for organizing ephemeral development artifacts under work-tmp/, separating per-feature working materials from general throwaway files and Claude plan outputs.

Changes:

• Document a work-tmp/features/<feature-name>/ structure for per-feature implementation plans, notes, and test apps.
• Keep work-tmp/ available for one-off temporary files.
• Update Claude Code configuration to write plans to work-tmp/plans/.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
AGENTS.md	Adds the new work-tmp/features/<feature-name>/ convention and recommended internal structure.
.github/copilot-instructions.md	Mirrors the updated work-tmp/ organization guidance for Copilot usage.
.cursor/rules/overview.mdc	Mirrors the updated work-tmp/ organization guidance for Cursor rules.
.claude/settings.json	Moves plansDirectory to ./work-tmp/plans to separate plan outputs from feature working files.