add local buddy and local ultraplan flow

[LaplaceYoung]

Summary

This PR brings the local /buddy and /ultraplan capability gap fixes on top of free-code, based on a direct comparison against Enchograph/whu-code.

The comparison showed that whu-code also contains a large set of branding and i18n commits that are not part of this change. This PR intentionally keeps the scope narrow and only carries the buddy / ultraplan / Sorux-related deltas that are needed to restore the missing local workflows.

User Impact

Before this change:

• BUDDY could be enabled, but the command surface was incomplete and the build path expected modules that were not fully wired.
• /ultraplan still reflected the remote-first flow, which did not match the local-only expectation for this fork.
• local planning output was harder to inspect and reuse once a planning run completed.

After this change:

• /buddy is available as a local command surface with status display and interaction hooks.
• /ultraplan launches a local planner flow in a new terminal instead of depending on the remote CCR-style path.
• completed planning artifacts can be previewed and reinserted back into the current session.
• Sorux wrapper updates preserve the caller working directory for local launch flows.

Root Cause

This fork had already diverged from upstream free-code, but the local companion and planning workflows were only partially wired. In practice that left the repository with feature flags, UI affordances, and expectations for /buddy and /ultraplan, while key local execution pieces were still missing or still shaped around the remote implementation.

Fix

The patch set is intentionally scoped to the local workflow path:

• add the /buddy command entrypoint and local companion card / observer behavior
• extend companion state handling so buddy interactions can be surfaced consistently in the REPL
• replace the old remote-oriented /ultraplan flow with a local terminal orchestration path
• add ultraplan profiles, planner prompt generation, artifact storage, artifact preview, and workspace snapshot capture
• wire the choice dialog and prompt input notices to the new local ultraplan lifecycle
• update Sorux launch handling so local planner launches preserve the active working directory
• add focused tests for Sorux wrapper behavior and the new ultraplan helpers

Verification

Verified in a clean git worktree created from HEAD for this PR branch:

• bun install
• bun test
• bun run build

Results:

• bun test: 14 passed, 0 failed
• bun run build: succeeded and built ./cli

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