refactor: remove legacy conversion subsystem

[SkyeAv]

Removes the legacy TableConfigs-to-v12 conversion subsystem because it is too difficult to maintain. Current v12 workflows and unrelated compatibility behavior remain intact.

Converter Removal

• Implementation: Deletes src/tablassert/legacy.py, its tests, fixtures, CLI command, and converter-specific errors/codes.
• CLI surface: Leaves exactly five commands; convert-legacy now fails with an unknown-command error.
• Documentation: Removes converter guidance from docs/cli.md and docs/agent.md.

Design

• Intentional break: Legacy configs no longer have an in-project conversion path; existing v12 configs remain supported.
• Compatibility: Fullmap compatibility, rig-legacy-keys, relationship_strength, and retained legacy data paths are unchanged.
• Scope: 13 intended paths changed; no dependency, Rust, CI, Makefile, or changelog changes.

Testing

• uv run pytest -q → 930 passed, 37 skipped
• Focused docs/error/assembly tests → 23 passed, 3 skipped
• Boundary compatibility tests → 4 passed
• uv run ruff check . → passed
• uv run ruff format --check . → 75 files formatted
• uv run pyright → 0 errors
• Converter-token and deleted-module sweeps → zero matches
• Independent whole-diff audit → PASS

[coderabbitai]

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