feat(sdkx): tool migration wrappers + Anthropic Memory Tool

[lIang70]

Summary

Phase 3 of the sdkx track: lands sdkx/tool/{knowledge,kanban,history,memory} so users can switch their imports before sdk/v0.3.0 deletes the corresponding helpers from sdk/{knowledge,kanban,history}. Public signatures stay identical, so the v0.3.0 cut becomes a pure go get -u for callers — no source edits after the import swap.

Package	Strategy
sdkx/tool/knowledge	Full mirror (only depends on public sdk/knowledge API).
sdkx/tool/kanban	Full mirror; WithKanban/KanbanFrom forward to sdk/kanban so contexts installed on either side interoperate.
sdkx/tool/history	Go type alias + delegation. The underlying tools reach into package-private helpers (archiveImpl, loadManifestImpl, SummaryDAG{store,config}) that can't be exported without growing sdk's stable surface. The alias pins the API shape now; the implementation relocates at the sdk/v0.3.0 cut.
sdkx/tool/memory	Net-new Anthropic Memory Tool (memory_20250818) wrapper over workspace.Workspace. Single tool, command enum, mandatory /memories prefix, view-byte cap, str_replace ambiguity errors, path-traversal guard.

Each package ships a doc.go explaining the sdkx layering rationale and migration path. Tests cover:

• mechanical contracts (definition names, registry registration);
• kanban context-key interop (sdk-installed ↔ sdkx-readable, both directions);
• history type-alias interop (var sdk Hist.ToolDeps = sdkx.ToolDeps{});
• all 6 memory commands incl. truncation, prefix enforcement, and traversal denial.

docs/migrations/v0.3.0.md: documents sdk↔sdkx release coordination — users do a one-line import swap during v0.2.x, then a paired go get -u at v0.3.0 cut, no other source edits.

Test plan

• make fmt clean across the workspace
• cd sdkx && go vet ./...
• cd sdkx && go test ./tool/... -count=1 — all four packages pass
• kanban context-key interop test exercises both directions
• history type-alias interop test guards against future type Foo X regression
• memory tool: 15/15 cases incl. truncation, traversal denial, str_replace ambiguity

Notes

• Pure additive in sdk (zero changes); no [skip-tag:sdk] needed.
• The history package is intentionally a thin forwarding layer in v0.2.x — see commit message and the package doc.go for why path D (alias + delegation) was preferred over exporting private helpers or duplicating archive logic.

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