docs: add the unified OpenOCD plan, note worktree dep symlinks

The plan doc records why the fork exists and how each vendor source was
ported; the interim handoff it superseded is dropped.

CLAUDE.md: a new worktree should symlink the dependency dirs to the
primary checkout rather than re-fetching them, replacing a single
symlink only when the branch needs a different dep revision. Also allow
'linke' in codespell - WCH-LinkE is a product name.

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