chore(release): v3.23.0 — sonnet-5 default, upgrade reliability, CLAUDE_SYSTEM_PROMPT, README restructure (#178)

* chore(release): v3.23.0 — sonnet-5 default, upgrade reliability, CLAUDE_SYSTEM_PROMPT, README restructure

Consolidates #167/#168/#170-#177 (merged since the v3.22.1 tag). 3.22.1 → 3.23.0.

Minor because #168 changes the default model for every request that omits
`model` (sonnet alias 4-6 → 5) and #175 makes CLAUDE_SYSTEM_PROMPT functional —
behavior changes and a newly-working env var; not major because no API surface
breaks and pinning restores the old default.

Release-kit walk: CLAUDE_SYSTEM_PROMPT README row added in #175 (incl. cache
caveat); Available Models table updated in #168 (sonnet-5 = default); no new
endpoint; models.json alias change is the SPOT edit; new docs/ files indexed in
Repository Layout (#172); bootstrap quirks retained in README §Troubleshooting.
Version sourced from package.json only (no stale refs — grepped).

Tag push v3.23.0 at this squash commit triggers release.yml.

Co-Authored-By: Claude <claude-opus-4-8> <noreply@anthropic.com>

* docs(readme): CLAUDE_SYSTEM_PROMPT cache caveat updated — #177 made the flush obsolete (release reviewer F1)

---------

Co-authored-by: dtzp555 <dtzp555@gmail.com>
Co-authored-by: Claude <claude-opus-4-8> <noreply@anthropic.com>

CHANGELOG.md

@@ -1,10 +1,25 @@
 # Changelog
 
-## Unreleased
+## v3.23.0 — 2026-07-17
+
+Minor release. Headline: **the default `sonnet` alias now resolves to Claude Sonnet 5** — a behavior change for every request that omits `model` (pin `claude-sonnet-4-6` by full ID to keep the previous default). Also: Windows-safe upgrade snapshots, two upgrade-system reliability fixes from a live fleet update, the `CLAUDE_SYSTEM_PROMPT` env var made functional, cache-key honesty for config changes, a billing-policy status correction (the 2026-06-15 `-p` split is PAUSED by Anthropic), and a major README restructure. No new endpoint; no new `cli.js` wire behavior. Every code PR carried a fresh-context reviewer (Iron Rule 10).
 
 ### Changed
 
-- **Default `sonnet` alias → `claude-sonnet-5`.** The `sonnet` alias (the model used for every `/v1/chat/completions` request that omits `model`, and OpenClaw's OCP primary via `ocp-connect`) now resolves to `claude-sonnet-5` instead of `claude-sonnet-4-6`. `claude-sonnet-4-6` remains available by full ID for pinning. This is a behavior change for clients relying on the default — pin `claude-sonnet-4-6` explicitly to retain the previous model. Split out from the additive `claude-sonnet-5` model entry (#152) per Iron Rule 11.
+- **Default `sonnet` alias → `claude-sonnet-5` (#168, contributed by @vvlasy-openclaw).** The `sonnet` alias (the model used for every `/v1/chat/completions` request that omits `model`, and OpenClaw's OCP primary via `ocp-connect`) now resolves to `claude-sonnet-5` instead of `claude-sonnet-4-6`. `claude-sonnet-4-6` remains available by full ID for pinning. Mirrors the shipped Claude CLI's own `latest_per_family` mapping (`sonnet → claude-sonnet-5`, verified from binary 2.1.211). Split out from the additive model entry (#152) per Iron Rule 11.
+- **`CLAUDE_SYSTEM_PROMPT` is now functional (#175).** The var was read, documented, and echoed on `/health.systemPrompt` but never reached a request (dead since the `APPEND_SYSTEM_PROMPT` retirement). It is now appended (last, trimmed) to the composed system prompt on the default `-p` path via the new pure `lib/prompt.mjs`; TUI-mode panes are unaffected. Unset ⇒ byte-identical composition to before. README § Environment Variables documents it, including the cache caveat below.
+
+### Fixed
+
+- **Windows-safe upgrade snapshot paths (#167, contributed by @nyxst4ck).** Snapshot directory timestamps now use `-` instead of `:` (Windows forbids `:` in names); legacy colon-named snapshots keep parsing, and `listSnapshots` now orders by **parsed timestamp** (with a deterministic name tie-breaker) so mixed legacy/new names sort chronologically — the initial revision's raw-string sort could delete the newest recovery snapshot at the format boundary and was caught in review; regression tests pin the same-hour mixed-format case.
+- **`ocp update` reliability — two live-incident fixes (#174, closes #173).** (1) The doctor now runs `git fetch --tags` (offline-tolerant) before computing `latest_version` — previously it compared against the locally cached `origin/main`, so machines that hadn't pulled since a release reported "Already at latest" forever. (2) Post-flight now asserts `/health.version` equals the upgrade target (new `postFlightOk` predicate) instead of accepting any `auth.ok` — a stale orphan process holding the port used to pass post-flight while still serving the old version; the failure message now reports the last-seen version and points at `ss -ltnp`/`lsof -i`.
+- **Response-cache key now carries a boot-config epoch (#177, closes #176).** The persistent cache keyed on model+key+params+messages but not on server config that shapes answers (`CLAUDE_SYSTEM_PROMPT`, wrapper text, `CLAUDE_ALLOWED_TOOLS`, `CLAUDE_NO_CONTEXT`) — changing any of these and restarting could serve stale-config answers until TTL expiry. A sha256 config-epoch is folded into every key; any config change is an instant whole-cache invalidation. One-time side effect: existing cache entries miss once after this upgrade.
+
+### Docs
+
+- **Billing-policy status corrected (#171).** Anthropic **paused** the announced 2026-06-15 `claude -p` billing split on its effective date (official help-article citation in README § How It Works): the default `-p` path currently bills the subscription, and TUI-mode is reframed as the ready-made **hedge** for if/when a reworked change lands. All in-force assertions of the split are now date-stamped and conditioned.
+- **LAN mode scoped to chat-class workloads (#171).** New "workload fit" paragraph: multi-device OCP is for text-in/text-out workloads; client-machine coding agents are architecturally out of scope (tools execute on the OCP host).
+- **README restructured, 1205 → ~500 lines (#172).** Operations-manual content moved to `docs/lan-mode.md`, `docs/tui-mode.md`, `docs/troubleshooting.md`, `docs/upgrading.md` (verbatim moves + two canonical dedups; zero content loss verified section-by-section). README keeps the quickstart, the release-kit-pinned reference tables, and summary stubs with links. Plus a staleness sweep (#170): 6-model examples, removal of the never-existed `ocp stop` command, `ocp-connect` claims corrected, current version examples.
 
 ## v3.22.1 — 2026-07-17