feat(palace): add MemoryScope::All and Wing/Room variants (jcode shape) (mp-migration 3/8)

[quangdang46]

Summary

Extend MemoryScope enum with 3 jcode-compat variants and 3 helper methods:

pub enum MemoryScope {
    Local,                            // existing
    Global,                           // existing
    Auto,                             // existing
    All,                              // NEW — jcode's MemoryScope::All
    Wing(String),                     // NEW — limit to a specific wing
    Room { wing: String, room: String },  // NEW — limit to (wing, room)
}

impl MemoryScope {
    pub fn includes_project(&self) -> bool;  // NEW
    pub fn includes_global(&self) -> bool;   // NEW
    pub fn is_all(&self) -> bool;            // NEW
}

Motivation

Required for the jcode → mempalace Mode C library migration (mp-migration 3/8). jcode's MemoryScope::{Project, Global, All} is the canonical enum; without All the adapter has to call remember twice (once for Local, once for Global) and merge — error-prone and races with concurrent writes. Wing(String) and Room { wing, room } cover jcode's per-wing/per-room calls that today are sugar over SearchScope filters.

This is PR 3/8 in the migration series. Independent of the trait-method PRs (1/2/4) — pure enum extension.

Change

crates/core/src/palace.rs — extends the existing MemoryScope enum from 3 to 6 variants and adds 3 methods.

The Copy derive is removed (new Wing(String) and Room { … } variants can't be Copy); Clone is added. This is technically a breaking change for any external code that copied the enum by value, but the trait's other call sites already pass by reference so no internal call site breaks. The enum is #[non_exhaustive] so adding variants is non-breaking at the type level.

includes_project / includes_global semantics:

• Local, Auto → only project
• Global → only global
• All → both
• Wing(_), Room { .. } → project only (named scopes live in the local palace; jcode has no concept of a global-palace wing)

Test plan

• cargo test -p mempalace-core --lib → 1127 passed, 0 failed (250s)
• cargo check -p mempalace-core clean
• cargo fmt --check -p mempalace-core clean
• CI green on ubuntu/macos/windows

Series status

#	Title	Status
6	docs(palace): document Embedder reuse on search_with_embedding	merged #16
7	feat(palace): add tags/trust/access_count/reinforcements/superseded_by to Drawer	open #17
8	feat(palace): add MemoryProvider::graph_stats_legacy (jcode shape)	open #18
1	feat(palace): add boost/decay/reinforce/supersede/set_metadata to MemoryProvider	open #19
2	feat(palace): add tag/untag/link/list_tags to MemoryProvider	open #20
4	feat(palace): add MemoryProvider::recent for retention-ranked recall	open #21
3	feat(palace): add MemoryScope::All and Wing/Room variants	this PR
5	feat(palace): add ActivityEvent sink on PalaceBuilder	next

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