chore(build,gitignore): Refactor web directory structure and build co…

[jamesbconner]

…nfig

• Replace index.html placeholder with .gitkeep to preserve empty web directory
• Update .gitignore to ignore .claude/ and CLAUDE.md files
• Simplify web directory exclusion pattern in .gitignore comments
• Update pyproject.toml wheel build config to exclude only .gitkeep
• Add sdist force-include configuration for web directory
• Streamline build artifact handling to use .gitkeep instead of placeholder file

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Note

Medium Risk
Packaging and ignore-rule changes can alter what ships in wheels/sdists and what ends up committed, potentially breaking releases if the web directory contents are not handled as intended.

Overview
Refactors how src/tablesleuth/web is treated as a build artifact: .gitignore now ignores everything under the directory except .gitkeep, and Hatch wheel/sdist configuration is adjusted to include the directory while excluding only .gitkeep from the wheel.

Also expands .gitignore to exclude .claude/ and CLAUDE.md, and updates the committed src/tablesleuth/web/index.html contents (still present in-repo) to a new generated build output.

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