fix(bundler): reject unsupported catalog payload versions

[marcelsafin]

Description

Bundle catalog payloads can declare schema_version, but the loader currently ignores it and parses future incompatible formats under current assumptions.

This rejects unsupported major versions before reading entries. Payloads without a version remain accepted for backward compatibility, and compatible 1.x payloads retain current behavior.

Testing

• Tested locally with uv run specify --help
• Ran existing tests with uv sync && uv run pytest (6,652 passed, 177 skipped)
• Added a contract regression for an unsupported 2.0 payload
• uvx ruff@0.15.0 check src tests clean

AI Disclosure

• I did not use AI assistance for this contribution
• I did use AI assistance (describe below)

Implemented autonomously by GitHub Copilot CLI (model: GPT-5.6 Sol) under human direction; a failing contract regression was added before the fix, then the full suite and lint were run locally. Commit includes Assisted-by and Co-authored-by trailers.

[Copilot]

Pull request overview

Rejects incompatible bundle catalog schema versions while preserving support for versionless and 1.x payloads.

Changes:

• Adds catalog schema major-version validation.
• Adds a regression test for unsupported 2.0 payloads.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/specify_cli/bundler/models/catalog.py	Validates catalog payload schema versions before parsing entries.
tests/contract/test_catalog_schema.py	Tests rejection of unsupported schema versions.

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