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Recovery: legacy wing names split after the normalization change

Companion to #1675. normalize_wing_name now strips leading and trailing separators, so a path-encoded project dir like -home-user-proj derives the wing home_user_proj instead of _home_user_proj. Palaces mined before that change filed drawers under the old, separator-padded name. New mining and diary writes land on the new name, so the two no longer meet — the history is split, not lost. mempalace migrate-wings re-unites them.

Symptom

After upgrading, a project that used to surface its memories returns less than expected, and mempalace status shows two wings for one project — e.g. both _home_user_proj (old drawers) and home_user_proj (newly mined). MCP writes to the padded wing may also have been rejected, since sanitize_name does not accept a leading underscore.

Recovery

Preview first — this never modifies anything:

mempalace migrate-wings --dry-run
mempalace migrate-wings --dry-run --palace /path/to/palace

The plan lists each rename and flags collisions that will merge into an existing wing:

  Wing-name migration plan:
    '_home_user_proj' -> 'home_user_proj': 1284 drawer(s), 96 closet(s)  (MERGE into existing wing)

Apply it:

mempalace migrate-wings           # prompts for confirmation
mempalace migrate-wings --yes     # no prompt

What it does

Re-keys the wing metadata field on drawers and closets to the normalized form, merging collisions into the existing wing.
Re-keys the topics_by_wing registry (merging topic lists on collision).

What it leaves alone

Drawer/closet IDs are untouched. The wing in an ID (drawer_<wing>_…) is an opaque prefix that is never decoded back into a wing, so leaving it keeps closet →drawer_id pointers valid and lets future mining still skip already-mined files (no duplicates). The verbatim drawer content is never read or rewritten.
Tunnels already normalize wing names at read time, so they resolve under the new name without a rewrite.

Notes

Idempotent. A second run reports "nothing to migrate" and changes nothing.
Backend-agnostic. Works on any configured storage backend.
Run it once per palace after upgrading. New palaces are born with normalized wing names and never need it.

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