[release/13.4] Add proxyless endpoint on-demand allocation

[aspire-repo-bot]

Backport of #17851 to release/13.4

/cc @danegsta

Customer Impact

Ensure we can provide a concrete endpoint when referencing a proxyless container endpoint before container creation while still allowing dynamic allocation if the endpoint isn't required before creation. This ensures we don't block on endpoint allocation when a proxyless container endpoint doesn't have a hardcoded port defined, while still allowing us to allocate a random port otherwise.

Testing

Manual and automatic testing

Risk

Medium, but fixes a real issue

Regression?

Yes

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[github-actions]

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/microsoft/aspire/main/eng/scripts/get-aspire-cli-pr.sh | bash -s -- 17859

Or

• Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/microsoft/aspire/main/eng/scripts/get-aspire-cli-pr.ps1) } 17859"

[github-actions]

❓ CLI E2E Tests unknown — 110 passed, 0 failed, 2 unknown (commit 000d4aa)

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_{📹 Recordings uploaded automatically from CI run #26854366357}

[aspire-repo-bot]

✅ No documentation update needed.

docs_optional → internal_refactor

No signals triggered (signal_count == 0). The PR is a backport of #17851 that fixes a regression in proxyless container endpoint allocation — specifically, it adds an internal OnDemandEndpointAllocationAnnotation and adjusts EndpointAnnotation/ContainerCreator logic to defer port allocation for proxyless endpoints until they are actually needed. All 7 changed files are either internal hosting plumbing (src/Aspire.Hosting/ApplicationModel/, src/Aspire.Hosting/Dcp/) or test files — no new public API surface, no CLI changes, no user-visible configuration, and no behavior the existing docs describe was altered.