docs: fix documentation inaccuracies

[zhubert]

Summary

• CLAUDE.md: Remove nonexistent demo/ package, fix session_manager.go location (app/ → manager/), add 9 undocumented packages, add Linear to issues/ description, fix runner map name (claudeRunners → runners), fix MCP socket path format
• README.md: Fix theme switching claim (no t shortcut exists — themes are changed via settings modal)
• docs/index.html: Replace removed workflow config feature card with per-repo settings, fix broken #usage footer anchor → #quick-start

Test plan

• Verify all CLAUDE.md package paths match internal/ directory listing
• Confirm no broken links in index.html footer
• Spot-check keyboard shortcuts in README against shortcuts.go

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR updates public-facing documentation to better match the current behavior and structure of the codebase (package layout, UI behavior, and documentation site links).

Changes:

• Update docs landing page feature card content and fix the footer “docs” anchor link.
• Correct README theme-switching instructions.
• Refresh CLAUDE.md package tree and various implementation details (runner map name, session manager location, MCP socket path format, issue providers).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
docs/index.html	Renames a feature card and fixes the footer docs link anchor.
README.md	Corrects theme switching instructions to reflect current UX.
CLAUDE.md	Updates internal package inventory and several implementation details.

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[Copilot]

The new feature card text says allowed tools and squash-on-merge can be configured “via the settings modal”, but the current Settings modal only exposes theme/branch prefix/notifications/auto-cleanup (see internal/ui/modals/config.go), and there doesn’t appear to be UI for repo-level allowed tools or squash-on-merge. Consider adjusting this copy to match the actual configuration surfaces (e.g., allowed tools via permission prompts / config file; issue mapping via session settings; remove squash-on-merge mention unless it’s user-configurable in the UI).

Suggested change

	configure allowed tools, squash-on-merge, and issue provider
	mapping per repository via the settings modal.
	configure allowed tools via permission prompts or config file,
	and issue provider mapping via session settings, per repository.

[Copilot]

The socket path is documented as /tmp/pl-<shortID>.sock, but the implementation uses filepath.Join(os.TempDir(), "pl-"+shortID+".sock") (internal/mcp/socket.go). os.TempDir() is not always /tmp (e.g., macOS often uses /var/folders/...). Consider documenting it as $TMPDIR/pl-<shortID>.sock (or “in the OS temp dir”) to avoid inaccuracy.

Suggested change

	2. MCP server communicates with TUI via Unix socket (`/tmp/pl-<shortID>.sock`, first 12 chars of session ID)
	2. MCP server communicates with TUI via Unix socket in the OS temp directory (e.g., `$TMPDIR/pl-<shortID>.sock`, first 12 chars of session ID)