[07] Establish represented-to-live bridge convention

[alseif0x]

Refs #19

QA pending: do not merge until manual/capture validation, CI, and Codex reviewer verdict are complete.

Summary:

• Documents the represented-to-live intent bridge convention.
• Adds a small bridge API and converts duel acceptance as the example.
• Ensures the represented intent is recorded and live mutation is applied once.

Validation reported locally:

• PROTOC=/home/cdmonio/.local/protoc/bin/protoc cargo test -p wow-world --lib
• PROTOC=/home/cdmonio/.local/protoc/bin/protoc cargo check -p world-server
• cargo fmt --all -- --check
• git diff --check

Manual QA pending: duel accept flow in client and capture-clean comparison vs C++.

[alseif0x]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Swish!

Reviewed commit: a549f357c0

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[alseif0x]

QA validation checklist:

• This PR is mostly runtime plumbing/convention, so validate it as a client smoke test.
• Log in, enter world, move between nearby areas, target creatures/NPCs, and perform a basic attack/cast.
• Logout to character select and reconnect with the same client session; visible creatures/NPCs should reload normally.
• Watch for server crashes, missing nearby spawns, or obvious duplicate/stale object behavior.

If this stays green in checks, it can remain pending user QA; no special gameplay flow is expected beyond regression coverage.