Audit hidden legacy TUI workflows before re-exposing

[Hmbown]

Summary

v0.8.45 hides several stale or partially wired TUI surfaces from slash completion / command palette rather than shipping them as discoverable commands.

Review these in v0.8.46 and either wire them cleanly, move them into the intended product surface, or delete the dead code:

• /goal and commands/goal.rs: Work/checklist is now the default objective surface; decide whether goal state still needs a separate API.
• /links: provider docs/dashboard links should belong in provider selection/provider detail UI, not a standalone DeepSeek-branded command.
• /relay, /recall, /cycle, /cycles: checkpoint/relay/archive workflows need a real UX decision before being discoverable.
• /rlm: keep RLM as an internal/long-input tool path unless a clear user-facing command shape is justified.
• StatusItem::Coherence: kept only for old config deserialization; it should not render or appear in the statusline picker.
• Legacy .deepseek workspace paths: anchors/notes/memory now prefer .codewhale with legacy fallbacks; audit remaining state paths before removing compatibility.

Acceptance criteria

• Decide per surface: rewire, move, or delete.
• Add tests for any surface that becomes discoverable again.
• Keep slash completion, command palette, home/dashboard copy, and docs in sync.
• Do not reintroduce DeepSeek-TUI repo/path wording on CodeWhale-owned state.