chore: remove resolved WIP artifacts

[mattzcarey]

Summary

• remove the completed WIP worklogs and issue-specific verification harnesses under wip/
• remove the wip/* workspace glob and its three lockfile importers
• remove stale references to the deleted plans and keep the assistant example's useChats ownership note self-contained

Why

These files were useful while the affected features and fixes were being designed and validated, but their durable replacements now live in package tests, accepted design records, examples, and user documentation.

The removed issue harnesses cover fixes that have shipped:

• McpAgent: ctx.waitUntil(agent.destroy()) on session teardown logs "waitUntil() tasks did not complete" when the SSE client has already disconnected (0.13.3) #1625: deferred MCP session teardown
• Cannot perform I/O on behalf of a different Durable Object. #1677: facets no longer inspect the root Agent's WebSockets
• AIChatAgent orphaned stream recovery can merge a new assistant response into the previous assistant message #1691: orphan recovery preserves a new assistant turn as a distinct message

The raw workerd behavior isolated by the #1677 repro still occurs in production, but the Agents SDK now avoids that invalid access and has regression coverage for the facet/root connection boundary. This cleanup does not claim the underlying runtime behavior changed.

No changeset is needed because this removes internal WIP material and does not change a published package API or behavior.

Validation

• deployed the McpAgent: ctx.waitUntil(agent.destroy()) on session teardown logs "waitUntil() tasks did not complete" when the SSE client has already disconnected (0.13.3) #1625 harness and confirmed an aborted session DELETE converged to fully erased storage in about 2.45 seconds
• deployed the Cannot perform I/O on behalf of a different Durable Object. #1677 raw repro and confirmed the lower-level runtime behavior remains, while the SDK regression suite passes
• ran the AIChatAgent orphaned stream recovery can merge a new assistant response into the previous assistant message #1691 real-LLM recovery flow and confirmed the recovered turn remained distinct from the preceding assistant message
• pnpm run build
• pnpm run check
• pnpm exec nx affected -t test --base=origin/main (22 projects, all green)

[changeset-bot]

⚠️ No Changeset found

Latest commit: 7ae791d

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agents

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@cloudflare/ai-chat

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@cloudflare/channels

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@cloudflare/codemode

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hono-agents

npm i https://pkg.pr.new/cloudflare/agents/hono-agents@2160

@cloudflare/shell

npm i https://pkg.pr.new/cloudflare/agents/@cloudflare/shell@2160

@cloudflare/think

npm i https://pkg.pr.new/cloudflare/agents/@cloudflare/think@2160

@cloudflare/voice

npm i https://pkg.pr.new/cloudflare/agents/@cloudflare/voice@2160

@cloudflare/worker-bundler

npm i https://pkg.pr.new/cloudflare/agents/@cloudflare/worker-bundler@2160

commit: 7ae791d