revert: one image per devcontainer.json (#60) - feature abandoned

[alexanderilyin]

Reverts #60 before 1.0, so images[], instances and dryRun never ship in a release and aren't part of the 1.x API promise. Plans 004 and 005 record the feature as abandoned.

Why: Coder names an agent after its Terraform resource name and fails with duplicate agent name otherwise, so the template couldn't give each image its own agent. Without that, the multiple-image API has no consumer.

After this, a repository whose only configs are in .devcontainer/<folder>/ behaves as in 0.5.0: it falls back to fallbackImage, or fails.

• npm run build passes, and npm run test:unit passes 106/106 (feat(service): one image per devcontainer.json, listed in POST /build's images #60's own tests are removed with it).
• No docs outside the plans reference ADR-0016 or the removed fields.

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