feat(ai): add orthogonal Invocations primitives

[Wei Meng (m5i-work)]

Summary

Adds protocol-specific Invocations resource commands on top of the Responses primitives in #9900.

• adds azd ai agent invocations show [--invocation-id <id>]
• adds azd ai agent invocations cancel [--invocation-id <id>]
• saves the latest successful remote Invocation ID for implicit targeting
• captures IDs from x-agent-invocation-id or a 202 Accepted invocation_id body while preserving the body for existing LRO polling and raw output
• allows explicit IDs with --agent-endpoint and no project-backed state
• keeps explicit show/cancel operations from changing current selection
• treats cancellation of an already terminal Invocation as successful after confirming service state
• stores only the current Invocation ID; lifecycle operations do not inherit saved session or create context
• preserves existing synchronous, SSE, raw, and LRO Invocation create behavior

This is PR 2 of the replacement stack for #9676.

CLI

azd ai agent invoke "message" --protocol invocations
azd ai agent invocations show [--invocation-id <id>]
azd ai agent invocations cancel [--invocation-id <id>]

Validation

From cli/azd/extensions/azure.ai.agents:

• go test ./...
• go build ./...
• go fix ./...
• focused go test -race for Invocation identity, state, command, and endpoint tests
• command help smoke tests for invocations and invocations show

golangci-lint and cspell were not available on the local PATH; CI runs both.

Stack:

• Base: feat(ai): add orthogonal Responses primitives #9900

Supersedes #9706.
Fixes #9780

Part of #9676

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[Wei Meng (m5i-work)]

Live E2E validation

Built and installed the full stack with azd x build, then tested against the supplied longrun-invocations-v2-ref endpoint using {"steps":3,"delay_ms":200}.

Passed:

• existing 202 Accepted behavior captured the Invocation ID, polled, and completed all 3 steps
• invocations show --invocation-id ... --output table returned the completed Invocation
• implicit invocations show selected the saved current Invocation and returned the full JSON result
• lifecycle GET worked using only the Invocation ID/current endpoint, without persisted session context

Reference-agent limitation:

• POST /invocations/{id}/cancel returned HTTP 404 with cancel_invocation not implemented. The CLI surfaced a classified cancellation failure. This supplied reference agent validates create/poll and one-shot GET, but cannot validate the successful cancel path; that path remains unit-tested.

[azure-sdk-automation]

azure.ai.agents PR build

Note

This is an unsigned development build. Install it only if you trust this PR.

Install the extension:

azd ext install "https://azuresdkartifacts.z5.web.core.windows.net/azd/extensions/pr/9901/azure-ai-agents.zip"

• Version: 1.0.0-beta.14.pr.9901.6798094
• Merge commit: 108e64f