docs(v2.3): add Tool Gateway + Nous Portal sign-in to release notes + README

v2.3 now lands two themes together: Projects Grow Up (existing) and
Hermes v0.10.0 Tool Gateway support (new, just merged on the feature
branch). The release notes and the repo README's "What's New" section
are updated to reflect both.

Release notes:

- Headline intro rewritten to frame both themes as the v2.3 story.
- New "Tool Gateway — Nous Portal support" section between "Icon
  tweak" and "Migrating from 2.2.x": picker overlay merge surfacing 6
  previously-invisible providers, in-app device-code sign-in sheet,
  per-task Nous routing in the Auxiliary tab, Health card, Credential
  Pools dead-end fix + auth-type gating, Messaging Gateway rename.
- "Under the hood" gains the Tool Gateway services paragraph
  (NousSubscriptionService, NousAuthFlow, NousSignInSheet,
  CredentialPoolsOAuthGate) + the PYTHONUNBUFFERED=1 subprocess-env
  fix note. Test count bumped from 93 → 120 (14 new tests in
  ToolGatewayTests, NousAuthFlowParserTests, CredentialPoolsGatingTests).
- "Migrating from 2.2.x" gains a Hermes version paragraph spelling
  out that v0.10.0 is required for the Tool Gateway features (rest
  of 2.3 works on earlier Hermes, just without Nous in the picker
  or subscription data in Health).
- "Documentation" section lists the new Hermes Version Compatibility
  + Core Services wiki updates that accompany this release.

README:

- v2.3 "What's New" bullet list gains a Tool Gateway bullet
  positioned between the chat-indicator bullet and the window-layout
  bullet.
- Trailing "See the full release notes" line expanded to reference
  the Hermes Version Compatibility wiki page so users on Hermes v0.9
  know why they don't see Nous in their picker.

Companion wiki update already pushed in 741b253 on the wiki repo
(Hermes-Version-Compatibility, Core-Services, Home).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

README.md

@@ -25,9 +25,10 @@
 - **Per-project Sessions tab** — alongside Dashboard and Site. Shows chats attributed to the project, with a **New Chat** button that spawns `hermes acp` with the project's directory as the session cwd and attributes the result via a Scarf-owned sidecar (`~/.hermes/scarf/session_project_map.json`). Click any listed session to resume it with project context automatically restored.
 - **Agent actually knows what project it's in** — the architectural headline. Every project-scoped chat gets a Scarf-managed block auto-injected into the project's `AGENTS.md` before the session starts. Hermes reads AGENTS.md from the session's cwd at startup and picks up the block as part of its system prompt. Ask the agent *"what project am I in?"* and it answers with the project name, directory, template id + version, configuration field names, and registered cron jobs — pulled from the injected block. Secret-safe (field names only, never values), idempotent, bounded to `<!-- scarf-project:begin/end -->` markers so template-author content outside the block is preserved across refreshes.
 - **Project indicator in Chat** — folder chip in `SessionInfoBar` and `Chat · <ProjectName>` in the nav title when you're in a project-scoped chat. Resumed sessions keep the indicator by looking up the attribution sidecar at resume time.
+- **Tool Gateway — Nous Portal support** — Hermes v0.10.0 introduced subscription-routed tools (web search, image gen, TTS, browser automation). Scarf 2.3 merges Hermes's provider-overlay table into the model picker so **Nous Portal + 5 other previously-invisible providers** now appear, and ships a dedicated **Sign in to Nous Portal** sheet that runs the device-code flow end-to-end in-app — no terminal. Each of the 8 auxiliary sub-model tasks gets a per-task Nous toggle, a Tool Gateway card lands in Health, and Credential Pools' silent-fail dead-end for device-code providers is closed. Scarf's existing messaging-gateway section is renamed **Messaging Gateway** to disambiguate from the new Tool Gateway.
 - **Window-layout cleanup** — switching to Chat or a Sessions tab no longer grows the window past the screen. `.windowResizability(.contentMinSize)` + targeted `idealHeight` caps keep the window's floor at a sensible content minimum while letting users freely drag larger or smaller.
 
-See the full [v2.3.0 release notes](https://github.com/awizemann/scarf/releases/tag/v2.3.0) and the [Project Templates wiki page](https://github.com/awizemann/scarf/wiki/Project-Templates).
+See the full [v2.3.0 release notes](https://github.com/awizemann/scarf/releases/tag/v2.3.0), the [Project Templates wiki page](https://github.com/awizemann/scarf/wiki/Project-Templates), and the [Hermes Version Compatibility page](https://github.com/awizemann/scarf/wiki/Hermes-Version-Compatibility) for the Tool Gateway's Hermes v0.10.0 requirement.
 
 ### Previously, in 2.2