docs(project): explain agentic development model

[zoeyrose]

Summary

• identify the Rust client near the top of its README as part of Atrinik's Codex-driven next-generation reimplementation and improvement
• distinguish fresh MIT client code from human-created game content and media with their exact attribution, license, and notice records
• welcome direct human-written code contributions under the same clean-room, review, provenance, test, and validation gates

Fixes #52

Coordinates

• Base: main at 4f4f900950b29e6587861da941846880be2be619
• Head: docs/52-agentic-development-model at 0eefa373acc9f380c7f153f94242737561f57416
• Worktree: /workspaces/atrinik/workspace/worktrees/client/issue-52-agentic-development-model
• Profile: issue-52-agentic-development-model
• Commit: 0eefa373acc9f380c7f153f94242737561f57416 docs(project): explain agentic development model

Validation

• tools/validate.sh — passed formatting, strict Clippy, workspace tests and docs, dependency/advisory/license/source policy, foundation checks, headless/dummy-window probes, and byte-identical Linux/source package builds
• git diff --check 4f4f900950b29e6587861da941846880be2be619..HEAD — passed

Verification

This is documentation-only; it changes no executable, protocol, package, state, account, or game data, so interactive runtime verification is not applicable. The replacement stack's wrapper build/runtime adapters remain unavailable under atrinik/atrinik#266, #269, and #270; Classic is not a substitute.

The exact final-head checks are:

cd /workspaces/atrinik/workspace/worktrees/client/issue-52-agentic-development-model
tools/validate.sh
git diff --check 4f4f900950b29e6587861da941846880be2be619..HEAD

cd /workspaces/atrinik
./atrinik profile show issue-52-agentic-development-model --json
./atrinik topology show issue-52-agentic-development-model --state default --json

The profile resolves the client worktree at 0eefa373acc9f380c7f153f94242737561f57416; topology inspection confirms the replacement service boundary without launching unsupported adapters. No scenario, topology, state mutation, shutdown, or runtime cleanup is needed.

Keep the worktree, profile, and ignored review report while this PR is open. Cleanup is a separate post-merge request beginning with ./atrinik cleanup --dry-run --json.

[zoeyrose]

Delivery review update:

• complete 4f4f900950b29e6587861da941846880be2be619..0eefa373acc9f380c7f153f94242737561f57416 diff reviewed in primary and independent fresh-context passes; zero known actionable findings
• tools/validate.sh and git diff --check pass at the final committed head
• Linux, Windows, aggregate Client validation, CodeQL Actions/Rust/aggregate, and Conventional PR title checks all pass at that same head
• documentation-only runtime boundary confirmed: replacement adapters remain unavailable under Workspace: add Go, Cargo, Protobuf, renderer, toolkit, and website build contracts atrinik#266, #269, and #270; Classic is not a substitute, and no scenario, topology, state, or game data was created or mutated

Exact repeatable verification:

cd /workspaces/atrinik/workspace/worktrees/client/issue-52-agentic-development-model
tools/validate.sh
git diff --check 4f4f900950b29e6587861da941846880be2be619..HEAD

cd /workspaces/atrinik
./atrinik profile show issue-52-agentic-development-model --json
./atrinik topology show issue-52-agentic-development-model --state default --json

The profile resolves the client worktree at 0eefa373acc9f380c7f153f94242737561f57416; topology inspection is read-only and no shutdown is needed. Keep the worktree/profile while this PR is open; post-merge cleanup is a separate request beginning with ./atrinik cleanup --dry-run --json.