docs: 30-day overhaul — correctness audit, PR coverage, Nous Portal weave, sidebar reorg (#33782)

* docs(audit): correctness pass across getting-started, reference, features, messaging, developer-guide, guides, integrations, user-guide

* docs: add PR coverage for last 30d + Nous Portal weave + nav reorg + build fixes

- Add docs for top user-visible PRs that shipped without docs (api-server
  session control, kanban features, telegram pin/edit, provider client tag,
  xAI retired-model migration, cron name lookup, --branch update flag, etc.)
- Apply Nous Portal weave across 23 pages (tasteful one-liners on
  getting-started/learning-path, configuration, overview, vision, x-search,
  credential-pools, provider-routing, cron, codex-runtime, profiles, docker,
  messaging/index, multiple guides, plus FAQ + index promotion)
- Reorganize sidebar: split Messaging into Popular/M365/Chinese/Other,
  Reference into Command/Configuration/Tools-Skills sub-categories, add
  orphan developer-guide pages (web-search-provider-plugin,
  browser-supervisor), move features from Integrations back to Features,
  fold lone spotify into Media & Web.
- Regenerate skill stubs + catalogs (kanban-codex-lane, hermes-s6-container-
  supervision, web-pentest)
- Fix broken anchor links (security/cron, configuration/fallback, telegram
  large-files, adding-platform-adapters step-by-step)

website/docs/developer-guide/architecture.md

@@ -40,7 +40,7 @@ This page is the top-level map of Hermes Agent internals. Use it to orient yours
            ▼                                    ▼
 ┌───────────────────┐              ┌──────────────────────┐
 │ Session Storage   │              │ Tool Backends         │
-│ (SQLite + FTS5)   │              │ Terminal (7 backends) │
+│ (SQLite + FTS5)   │              │ Terminal (6 backends) │
 │ hermes_state.py   │              │ Browser (5 backends)  │
 │ gateway/session.py│              │ Web (4 backends)      │
 └───────────────────┘              │ MCP (dynamic)         │
@@ -130,7 +130,7 @@ hermes-agent/
 ├── skills/                   # Bundled skills (always available)
 ├── optional-skills/          # Official optional skills (install explicitly)
 ├── website/                  # Docusaurus documentation site
-└── tests/                    # Pytest suite (~3,000+ tests)
+└── tests/                    # Pytest suite (~25,000 tests across ~1,250 files)
 ```
 
 ## Data Flow