docs: add e2e-runbooks to Community Schemas table

[Lukk17]

Adds a row to the Community Schemas table in docs/customization.md for the e2e-runbooks schema.

e2e-runbooks (https://github.com/Lukk17/openspec-schemas) is an OpenSpec custom schema for capability-level end-to-end tests. Each capability gets an immutable spec, an immutable tasks-template, and one timestamped run record per execution. Assertions are observable behaviour only (HTTP status, response body, persisted state), and each run records start/end UTC, duration, and best-estimate LLM token consumption.

Follows the contribution note in the same section ("submit a PR adding a row to this table").

Summary by CodeRabbit

• Documentation
  • Added a new e2e-runbooks entry to the Community Schemas section, including maintainer and repository details.
  • Clarified its behavior and recording guarantees for easier reference.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 0a261535-9e4b-40fc-bc12-e883996701e9

📥 Commits

Reviewing files that changed from the base of the PR and between 737518b and 1c96622.

📒 Files selected for processing (1)

• docs/customization.md

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📝 Walkthrough

Walkthrough

A single row is added to the Community Schemas table in docs/customization.md, introducing the e2e-runbooks schema entry with its maintainer, repository link, and a description of its behavior and recording guarantees.

Changes

Community Schemas Documentation Update

Layer / File(s)	Summary
e2e-runbooks table row docs/customization.md	Adds a new row for e2e-runbooks to the Community Schemas table, including maintainer/repository references and a description of its behavior/recording guarantees.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• Fission-AI/OpenSpec#1043: Also modifies the Community Schemas table in docs/customization.md by adding a new community schema listing with maintainer and repository references, directly parallel to this change.

Suggested reviewers

• TabishB

Poem

🐇 A hop, a skip, a new row appears,
In the schemas table, e2e-runbooks cheers!
Maintainer linked, repository bright,
One line of docs added just right.
The warren grows, one entry at a time! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the documented addition of e2e-runbooks to the Community Schemas table.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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