docs(adr): classify zpmod as class 2

[ss-o]

Summary

• Classify zpmod as class 2 with trunk-based development on main.
• Record annotated vX.Y.Z release tags from reviewed, green main commits, exact-tag functional testing, and Pages publication from reviewed main commits only.
• Align the directly affected class enumerations and release/testing guidance.

Closes #497
Related: z-shell/zpmod#70

Verification

• trunk check --filter=markdownlint,git-diff-check on all six changed files
• python3 -m unittest scripts/test_validate_agent_policy.py -v (70 tests)
• python3 scripts/validate-agent-policy.py

Agent handoff

No handoff needed.

[Copilot]

Pull request overview

This PR updates org policy documentation (ADRs, runbooks, and contributor instructions) to explicitly classify zpmod as a class 2 (versioned tool/package) repository with trunk-based development on main, and to record the expected release/publication boundary and exact-tag functional testing obligations.

Changes:

• Adds zpmod to class-2 enumerations across the release/testing/branching ADRs and runbooks.
• Clarifies that zpmod releases are bounded by annotated vX.Y.Z tags from reviewed, green main commits, with functional testing on the exact tag commit.
• Aligns testing instructions and references to the owning audit/issues (#497, z-shell/zpmod#70).

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
runbooks/release.md	Adds zpmod as an example of a class-2 repo in the release runbook.
decisions/0013-repository-settings-baseline.md	Updates class-2 repo enumeration to include zpmod.
decisions/0009-testing-ci-strategy.md	Extends class-2 testing guidance to include zpmod exact-tag functional suite requirements and adds references.
decisions/0008-branching-model.md	Adds zpmod to the trunk-on-main set and to the canonical branch model table.
decisions/0007-release-publication-flow.md	Adds zpmod to class-2 release/publication policy and per-repo application notes.
.github/instructions/testing.instructions.md	Updates contributor-facing testing instructions to include zpmod as class 2 and clarifies exact-tag suite expectations.

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