feat(docs): show per-skill pages in the left sidebar (#26646)

Individual skill pages (e.g. /docs/user-guide/skills/bundled/productivity/notion)
had no sidebar rendered — the sidebar config only listed the two catalog index
pages. That was an intentional choice from an earlier 'too many entries would
drown product docs' concern, but the effect is that a user landing on any skill
page (via search, share link, or the catalog table) loses navigation entirely
and can't see related skills.

Wire build_sidebar_items() (which was already computed and discarded) back into
the sidebar. Structure:

  Skills
  ├── Bundled skills catalog       (catalog table, was already there)
  ├── Optional skills catalog      (catalog table, was already there)
  ├── Bundled
  │   ├── apple/
  │   │   ├── apple-apple-notes
  │   │   └── ...
  │   └── ... (one collapsed category per skill category)
  └── Optional
      └── ... (same)

Categories are collapsed by default so the top-level Skills entry doesn't
explode visually. Users browsing one skill see siblings in the same category;
the catalogs remain the at-a-glance entry point.

Also includes drift the regen script naturally produces on top of current main:
- creative-comfyui v5.0.0 → v5.1.0 page (author + new ref file)
- devops-kanban-worker SKILL.md updates
- new pages for optional skills that lacked generated docs:
  hyperliquid, finance-stocks, software-development/rest-graphql-debug
- updated optional-skills-catalog row for those

Validation:
- npx docusaurus build (en locale) succeeded — only pre-existing warnings
- inspected built productivity-notion/index.html: sidebar tree present,
  sibling productivity skills (airtable, linear, etc.) all linked

website/docs/user-guide/skills/optional/finance/finance-stocks.md

@@ -0,0 +1,112 @@
+---
+title: "Stocks — Stock quotes, history, search, compare, crypto via Yahoo"
+sidebar_label: "Stocks"
+description: "Stock quotes, history, search, compare, crypto via Yahoo"
+---
+
+{/* This page is auto-generated from the skill's SKILL.md by website/scripts/generate-skill-docs.py. Edit the source SKILL.md, not this page. */}
+
+# Stocks
+
+Stock quotes, history, search, compare, crypto via Yahoo.
+
+## Skill metadata
+
+| | |
+|---|---|
+| Source | Optional — install with `hermes skills install official/finance/stocks` |
+| Path | `optional-skills/finance/stocks` |
+| Version | `0.1.0` |
+| Author | Mibay (Mibayy), Hermes Agent |
+| License | MIT |
+| Platforms | linux, macos, windows |
+| Tags | `Stocks`, `Finance`, `Market`, `Crypto`, `Investing` |
+| Related skills | [`dcf-model`](/docs/user-guide/skills/optional/finance/finance-dcf-model), [`comps-analysis`](/docs/user-guide/skills/optional/finance/finance-comps-analysis), [`lbo-model`](/docs/user-guide/skills/optional/finance/finance-lbo-model) |
+
+## Reference: full SKILL.md
+
+:::info
+The following is the complete skill definition that Hermes loads when this skill is triggered. This is what the agent sees as instructions when the skill is active.
+:::
+
+# Stocks Skill
+
+Read-only market data via Yahoo Finance. Five commands: `quote`, `search`,
+`history`, `compare`, `crypto`. Python stdlib only — no API key, no pip
+installs. Yahoo's endpoint is unofficial and may rate-limit or change.
+
+## When to Use
+
+- User asks for a current stock price (AAPL, TSLA, MSFT, ...)
+- User wants to look up a ticker by company name
+- User wants OHLCV history or performance over a date range
+- User wants to compare several tickers side by side
+- User asks for a crypto price (BTC, ETH, SOL, ...)
+
+## Prerequisites
+
+Python 3.8+ stdlib only. Optional: set `ALPHA_VANTAGE_KEY` to enrich
+`market_cap`, `pe_ratio`, and 52-week levels when Yahoo's crumb-protected
+fields come back null. Free key: https://www.alphavantage.co/support/#api-key
+
+## How to Run
+
+Invoke through the `terminal` tool. Once installed:
+
+```
+SCRIPT=~/.hermes/skills/finance/stocks/scripts/stocks_client.py
+python3 $SCRIPT quote AAPL
+```
+
+All output is JSON on stdout — pipe through `jq` if you want to slice it.
+
+## Quick Reference
+
+```
+python3 $SCRIPT quote AAPL
+python3 $SCRIPT quote AAPL MSFT GOOGL TSLA
+python3 $SCRIPT search "Tesla"
+python3 $SCRIPT history NVDA --range 6mo
+python3 $SCRIPT compare AAPL MSFT GOOGL
+python3 $SCRIPT crypto BTC ETH SOL
+```
+
+## Commands
+
+### `quote SYMBOL [SYMBOL2 ...]`
+
+Current price, change, change%, volume, 52-week high/low.
+
+### `search QUERY`
+
+Find tickers by company name. Returns top 5: symbol, name, exchange, type.
+
+### `history SYMBOL [--range RANGE]`
+
+Daily OHLCV plus stats (min, max, avg, total return %). Ranges: `1mo`,
+`3mo`, `6mo`, `1y`, `5y`. Default: `1mo`.
+
+### `compare SYMBOL1 SYMBOL2 [...]`
+
+Side-by-side: price, change%, 52-week performance.
+
+### `crypto SYMBOL [SYMBOL2 ...]`
+
+Crypto prices. Pass `BTC` (the script appends `-USD` automatically).
+
+## Pitfalls
+
+- Yahoo Finance's API is unofficial. Endpoints can change or rate-limit
+  without notice — if requests start failing, that's why.
+- `market_cap` and `pe_ratio` may return null on `quote` when Yahoo's
+  crumb session isn't established. Set `ALPHA_VANTAGE_KEY` to backfill.
+- Add a small delay between bulk requests to avoid rate-limiting.
+- This is read-only — no order placement, no account integration.
+
+## Verification
+
+```
+python3 ~/.hermes/skills/finance/stocks/scripts/stocks_client.py quote AAPL
+```
+
+Returns a JSON object with `symbol: "AAPL"` and a numeric `price` field.