docs(project): disclose renderer development model

[zoeyrose]

Summary

• add a prominent development-model statement for the agentic next-generation renderer
• distinguish Codex-driven MIT renderer code and deterministic output from human-authored source art
• welcome direct human-written code under the same review, provenance, licensing, testing, and validation controls

Closes #28

Coordinates

• Base: main at 417207cfa39aa57dafa8947ea8c1fc27945fbf71
• Head: docs/agentic-development-model at 6a10ef406c8ed717d27d883cd63084e826a3e160
• Worktree: /workspaces/atrinik/workspace/worktrees/renderer/issue-28-agentic-development-model
• Profile: issue-28-renderer-docs
• Commit: 6a10ef4 docs(project): disclose renderer development model

Validation

• tools/validate.sh
• actionlint .github/workflows/*.yml
• git diff --check

The aggregate validation passed formatting, strict Clippy, unit and doc tests,
architecture/dependency/provenance checks, deterministic corpus comparison,
Vulkan offscreen and Xvfb/SDL window proofs, the Windows cross-target check,
release packaging, and SBOM/release validation.

Verification

This documentation-only replacement-renderer change has no applicable managed
runtime behavior. The exact repeatable verification is:

cd /workspaces/atrinik/workspace/worktrees/renderer/issue-28-agentic-development-model
tools/validate.sh
actionlint .github/workflows/*.yml
git diff --check

cd /workspaces/atrinik
./atrinik profile show issue-28-renderer-docs --json
./atrinik topology show issue-28-renderer-docs --state default --json

Review the first-screenful Development model section in README.md and the
opening contribution guidance in CONTRIBUTING.md. The profile and topology
inspection must resolve renderer head
6a10ef406c8ed717d27d883cd63084e826a3e160; no topology is started and no
shutdown is needed. Wrapper-integrated replacement build/runtime adapters
remain outside current capabilities under atrinik/atrinik#266,
atrinik/atrinik#269, and atrinik/atrinik#270; no Classic substitute is used.

[github-actions]

🎉 This PR is included in version 1.0.2 🎉

The release is available on:

• v1.0.2
• GitHub release

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