[harrymove-ctrl]

Summary

• Register memwal_namespaces MCP tool (readOnlyHint: true) backed by session.memwal.listNamespaces({ limit, cursor }) so agents can list populated namespaces along with their memory counts and storage usage.
• Add close-namespace suggestion helper (editDistance, isCloseNamespaceMatch, formatNamespaceSuggestionHint, tryListNamespaces) that best-effort queries listNamespaces({ limit: 50 }) when a target namespace has 0 memories.
• Update memwal_recall empty-result handling so an unpopulated or misspelled namespace is clearly distinguished (No matching memories found (namespace "<name>" currently holds 0 memories). Did you mean namespace "..."?) from a query with 0 semantic hits in a populated namespace, while degrading gracefully if listNamespaces is unavailable.
• Update memwal_restore so an empty namespace (total=0, restored=0, skipped=0, failed=0, truncated=false) explicitly states Namespace "<name>" holds 0 on-chain blobs. and suggests close existing namespaces.
• Document memwal_namespaces and namespace spelling diagnostics in docs/mcp/overview.md, docs/mcp/quickstart.md, and docs/mcp/reference.md.
• Add unit tests in services/server/scripts/mcp/__tests__/namespace-diagnostics.test.ts and restore.test.ts.

Fixes #416

Test Plan

• node --test --import tsx services/server/scripts/mcp/__tests__/*.test.ts (all MCP test suites pass)

[ducnmm]

Please address the actionable issue below before merging. Validation was offline; no production writes or live load tests were run.

[ducnmm]

[P2] Do not infer an empty namespace from an incomplete first page

tryListNamespaces fetches only 50 namespaces and drops has_more/next_cursor. If the queried namespace exists on a later page and recall has no semantic matches, activeEntry is missing here and the tool incorrectly reports that namespace holds 0 memories. This occurs on accounts with more than 50 namespace rows; the exact helpers reproduce it with has_more=true. Preserve page completeness and return an unknown/generic result, or finish pagination/perform a targeted lookup before asserting emptiness.

[harrymove-ctrl]

Addressed in 3b6760d.

1. Updated tryListNamespaces to preserve has_more and paginate across pages until the queried target namespace is found or pagination completes.
2. Updated emptyRecallText so that when pagination is incomplete (has_more is true) and activeEntry is not found, the tool returns a generic 'No matching memories found in namespace "".' message instead of incorrectly asserting that the namespace holds 0 memories.
3. Added unit tests verifying pagination traversal across pages and confirming that incomplete pages never trigger the empty-namespace diagnostic.

[harrymove-ctrl]

@ducnmm Updated in commit 9a188af to address review feedback:

1. In commit 3b6760d, tryListNamespaces was updated to walk pages via next_cursor and prevent falsely asserting an empty namespace when has_more is true or pagination is incomplete.
2. In commit 9a188af, resolved the shared OpenClaw unit test timing issue in packages/openclaw-memory-memwal/test/plugin.test.mjs by priming relayer compatibility before the timed test turn and providing sufficient timeout headroom for the socket abort event.

Ready for re-review.