docs: Align published v1.1.0 documentation and installation guidance #281

Summary

The English source has a few wording issues that should be corrected without changing runtime behavior:

• README.md › Update: “install.sh for its bundled copy” is ambiguous. The standalone installer manages a compatibility copy of the skill; clarify that relationship.
• README.md hero: center only the title, badges, language selector, and brief introduction in <div align="center">, closing the wrapper before body content. Keep visible copy and links unchanged, and keep the structure consistent with the existing Korean, Japanese, and Simplified Chinese README wrappers.
• RELEASING.md is version-pinned to v1.0.4 but still says to make it stable/Latest after publication and to verify that PyPI has no 1.0.4 files. v1.0.4 is already published and PyPI has its wheel and sdist. Keep the 2026-10-07 HTTP 404 as historical preparation evidence, and label the release-specific steps/status accordingly.
• RELEASING.md › Source and configuration gates: replace “explicit empty Codex home” with wording that identifies an explicitly selected home that lacks a state database.
• RELEASING.md › Human review: replace “pending time” with an unambiguous timestamp description.
• RELEASING.md › Verified standalone installation: clarify that the remote target need not have internet access or a preinstalled session-peer, while the selected agent’s native inbox/queue remains necessary for messaging.

Evidence

• Published immutable GitHub release v1.0.4: https://github.com/abruption/session-peer/releases/tag/v1.0.4
• PyPI v1.0.4 has a wheel and sdist: https://pypi.org/project/session-peer/1.0.4/
• The explicit missing-home behavior is covered in tests/codex/test_multi_home_list.py (test_not_installed_is_success_but_explicit_missing_is_error).
• docs/cli-reference.md distinguishes remote installation without internet access from messaging, which still requires the target agent’s native inbox or queue.

Acceptance criteria

• Make minimal English-source edits only; do not change runtime behavior or broaden support/security claims.
• For the README hero, preserve all existing text and URLs exactly; the wrapper must end before the first body section, matching the other locale READMEs.
• Update every affected existing Korean, Japanese, and Simplified Chinese translation in the same isolated PR.
• Preserve historical release evidence, exact commands/flags, identifiers, links, and safety boundaries.
• Run the relevant Markdown/i18n/documentation checks and record their results.

PR #278 (Korean) and PR #280 (Japanese/Simplified Chinese) have since been merged. Their centered localized README headers are the reference for this English hero alignment; do not rewrite those already-merged changes. The README hero-alignment subtask may be merged only after normal repository protections and current-head checks/reviews pass, under the user's 2026-10-08 authorization. It does not close this issue because the original English wording and affected-translation corrections remain. No tag, release, package publication, or operational change is part of this issue.

Maintenance scope update — 2026-10-12

The user authorized documentation/test maintenance after published v1.1.0. Reuse this existing issue instead of opening overlapping documentation work. Retain the original wording/installation acceptance above; the English README hero subtask is already merged.

• Correct all four README release summaries: v1.1.0 is published, not an unpublished candidate, with v1.0.4 kept as historical maintenance context.
• Correct all four RELEASING records and handoff-runtime guides. Mark v1.1.0-specific preparation/publication commands as historical examples for an already published immutable version; never invite tag movement or repeated publication.
• Keep limited shipped handoff support distinct from OPEN feat(handoff): expose explicit ACK, deadline, and unknown outcome for unanswered requests #181/fix(identity): pin list-to-send targets to a session generation and fail closed when stale #180/investigate(codex): align selected home inspection with native SQLite storage configuration #268 acceptance, companion skill follow-up feat(delivery): frame unverified peer messages for Codex, Antigravity and Relay receivers #232 and operational rollout. Publication is not fleet/live-agent/hosted acceptance.
• Preserve RC4 history, pinned security evidence, manager ownership, commands/links and semantic alignment across en/ko/ja/zh-CN; update matching documentation regression tests and i18n manifest hashes.

Verified publication sources: https://github.com/abruption/session-peer/releases/tag/v1.1.0 and https://pypi.org/pypi/session-peer/1.1.0/json . Exact release/main source: 8ca77cf; GitHub publishedAt 2026-10-09T06:46:41Z, PyPI wheel/sdist uploaded 2026-10-09T08:04:35.784992Z / 08:04:37.631417Z.

This extension authorizes an isolated docs/tests PR and checks only. No runtime behavior change, merge, tag, release, package publication or operational change is included.