[shepherding] `/tdai-memory-forget` — interactive redacted-preview memory deletion

Is this feature related to a problem? | 该功能需求是否与某个问题相关？请描述

Shepherding issue split out of #1070. Follow-up PR author: @kbob3687-hub. Targets feat/server_team.

Background

The repository currently has no first-class "forget" command. Low-level delete APIs exist (sdk/memory-core/.../memory-prompt.delete, MemoryCore/.../skill-core.delete) but there's no UX layer that lets a Pi user selectively delete memory entries with a redacted preview before committing — which is exactly the pattern we want across clients, not just Pi.

#1070 landed a working /tdai-memory-forget interactive flow. It's a net-new UX primitive worth landing on its own so it can later be lifted to CodeBuddy / Codex / OpenCode.

In scope

• Interactive /tdai-memory-forget command in the Pi adapter surface
• Redacted preview (show what will be deleted, with sensitive fields masked) before commit
• Explicit confirm/cancel gate (destructive-op discipline — same pattern as mem:create-task / mem:update-task)
• Wire-in point: Pi adapter command surface; underlying deletes reuse existing SDK/core APIs — no new low-level delete code

Out of scope

• Modifying MemoryCore delete semantics
• Bulk / policy-based forgetting (that's a separate design)
• Lifting the command to other clients — do that in a follow-up once the Pi shape has stabilized

Acceptance criteria

• Preview shows redacted content, not raw memory
• Confirm required before any actual delete call
• Cancel path leaves memory untouched (unit test)
• Deletes are idempotent (double-confirm ≠ double-delete)
• No modifications to handler.ts or session/codebuddy/init.ts
• Docs include one screenshot / transcript of the preview flow

Related

• Closes down the /tdai-memory-forget portion of #1070
• Reuses memory-prompt.delete / skill-core.delete — no new deletion primitives should appear

Suggested branching

Branch name: pi-adapter/tdai-memory-forget against feat/server_team.

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