docs: Linear-spawned issue contract for Codex in AGENTS.md

[Oba-One]

Adds a consistent Linear-Spawned Issue Contract to AGENTS.md so Codex operates reliably when delegated a Linear issue — part of a 3-repo rollout (green-goods, network, coop).

Core (same across all three):

• The Linear issue is the spec — read it + this file + any .plans/<feature> lane it references.
• Codex-ready gate — proceed only with acceptance criteria + named surface / package:* + validation; otherwise stop and comment, don't guess.
• Executor, not orchestrator — cross-lane sequencing lives in .plans/status.json + the human.
• Branch + PR — target the issue's integration branch; PR body links the issue (Closes PRD-NNN); never self-merge; contracts get extra review.
• Run the repo's validation gate (and produce evidence) before opening the PR.

Tailored per repo to its actual commands and existing structure — green-goods' Validation Ladder; coop's Planning-OS *.codex.todo.md lanes; network had no Linear/lane model before this.

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Reviewing files that changed from the base of the PR and between 84152bd and 021f7a2.

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• AGENTS.md

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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/codex-linear-contract

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Pull request overview

Adds Codex-specific guidance for handling Linear-dispatched issues in AGENTS.md, defining how Linear issues should be treated as specs and how Codex should validate, scope, branch, and open PRs for delegated work.

Changes:

• Adds a new Linear-spawned issue contract for Codex.
• Defines readiness requirements, scoped execution expectations, PR linkage, and validation evidence.
• Connects Linear issue work to repo package surfaces and privacy constraints.

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