feat(optional-skills): port Anthropic financial-services skills as optional finance bundle (#21180)

Adds 7 optional skills under optional-skills/finance/ adapted from
anthropics/financial-services (Apache-2.0):

  excel-author        — openpyxl conventions: blue/black/green cells,
                        formulas over hardcodes, named ranges, balance
                        checks, sensitivity tables. Ships recalc.py.
  pptx-author         — python-pptx for model-backed decks (pitch,
                        IC memo, earnings note) that bind every number
                        to a source workbook cell.
  dcf-model           — institutional DCF (49KB skill): projections,
                        WACC, terminal value, Bear/Base/Bull scenarios,
                        5x5 sensitivity tables. Ships validate_dcf.py.
  comps-analysis      — comparable company analysis: operating metrics,
                        multiples, statistical benchmarking.
  lbo-model           — leveraged buyout: S&U, debt schedule, cash
                        sweep, exit multiple, IRR/MOIC sensitivity.
  3-statement-model   — fully-integrated IS/BS/CF with balance-check
                        plugs. Ships references/ for formatting,
                        formulas, SEC filings.
  merger-model        — accretion/dilution analysis for M&A.

All seven are optional (not active by default). Users install via
'hermes skills install official/finance/<skill>'.

Hermesification:
- Stripped every Office JS / Office Add-in / mcp__office__*
  branch — skills assume headless openpyxl only.
- Replaced Cowork MCP data-source instructions with 'MCP first (via
  native-mcp), fall back to web_search/web_extract against SEC EDGAR
  and user-provided data'.
- Swapped Claude tool references (Bash, Read, Write, Edit, mcp__*)
  for Hermes-native equivalents and Python library calls.
- Canonical Hermes frontmatter (name/description/version/author/
  license/metadata.hermes.{tags,related_skills}).
- Descriptions tightened to 187-238 chars, trigger-first.
- Attribution preserved: author field credits 'Anthropic (adapted by
  Nous Research)', license: Apache-2.0, each SKILL.md links back to
  the upstream source directory.

Verification:
- All 7 discovered by OptionalSkillSource with source_id='official'
- Bundle fetch includes support files (scripts, references, troubleshooting)
- related_skills cross-refs all resolve within the bundle
- No Claude product / Cowork / Office JS / /mnt/skills leakage
  remains in body text (bounded mentions only in attribution blocks)

Source: https://github.com/anthropics/financial-services (Apache-2.0)

optional-skills/finance/3-statement-model/references/sec-filings.md

@@ -0,0 +1,125 @@
+# SEC Filings Data Extraction Reference
+
+**When to Use:** Only reference this file when a model template specifically requires pulling data from SEC filings (10-K, 10-Q). For templates that provide data directly or use other data sources, this reference is not needed.
+
+---
+
+## Extracting Data from SEC Filings (10-K / 10-Q)
+
+When populating a model template with public company data, extract financials directly from SEC filings.
+
+### Step 1: Locate the Filing
+
+1. Use SEC EDGAR: `https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=[TICKER]&type=10-K`
+2. For quarterly data, use `type=10-Q`
+
+### Step 2: Identify Filing Currency
+
+Before extracting data, identify the reporting currency:
+- Check the cover page or header for reporting currency
+- Look at statement headers (e.g., "in thousands of U.S. dollars")
+- Review Note 1 (Summary of Significant Accounting Policies)
+
+**Common Currency Indicators**
+
+| Indicator | Currency |
+|-----------|----------|
+| $, USD | US Dollar |
+| €, EUR | Euro |
+| £, GBP | British Pound |
+| ¥, JPY | Japanese Yen |
+| ¥, CNY, RMB | Chinese Yuan |
+| CHF | Swiss Franc |
+| CAD, C$ | Canadian Dollar |
+
+Set model currency to match filing; document in Assumptions tab.
+
+### Step 3: Navigate to Financial Statements
+
+Within the 10-K or 10-Q, locate:
+- **Item 8** (10-K) or **Item 1** (10-Q): Financial Statements
+- Key sections to extract:
+  - Consolidated Statements of Operations (Income Statement)
+  - Consolidated Balance Sheets
+  - Consolidated Statements of Cash Flows
+  - Notes to Financial Statements (for schedule details)
+
+### Step 4: Data Extraction Mapping
+
+**Income Statement (from Consolidated Statements of Operations)**
+
+| Filing Line Item | Model Line Item |
+|------------------|-----------------|
+| Net revenues / Net sales | Revenue |
+| Cost of goods sold | COGS |
+| Selling, general and administrative | SG&A |
+| Depreciation and amortization | D&A |
+| Interest expense, net | Interest Expense |
+| Income tax expense | Taxes |
+| Net income | Net Income |
+
+**Balance Sheet (from Consolidated Balance Sheets)**
+
+| Filing Line Item | Model Line Item |
+|------------------|-----------------|
+| Cash and cash equivalents | Cash |
+| Accounts receivable, net | AR |
+| Inventories | Inventory |
+| Property, plant and equipment, net | PP&E (Net) |
+| Total assets | Total Assets |
+| Accounts payable | AP |
+| Short-term debt / Current portion of LT debt | Current Debt |
+| Long-term debt | LT Debt |
+| Retained earnings | Retained Earnings |
+| Total stockholders' equity | Total Equity |
+
+**Cash Flow Statement (from Consolidated Statements of Cash Flows)**
+
+| Filing Line Item | Model Line Item |
+|------------------|-----------------|
+| Net income | Net Income |
+| Depreciation and amortization | D&A |
+| Changes in accounts receivable | ΔAR |
+| Changes in inventories | ΔInventory |
+| Changes in accounts payable | ΔAP |
+| Capital expenditures | CapEx |
+| Proceeds from issuance of common stock | Equity Issuance |
+| Proceeds from / Repayments of debt | Debt activity |
+| Dividends paid | Dividends |
+
+### Step 5: Extract Supporting Detail from Notes
+
+For schedules, pull from Notes to Financial Statements:
+- **Note: Debt** → Maturity schedule, interest rates, covenants
+- **Note: Property, Plant & Equipment** → Gross PP&E, accumulated depreciation, useful lives
+- **Note: Revenue** → Segment breakdowns, geographic splits
+- **Note: Leases** → Operating vs. finance lease obligations
+
+### Step 6: Historical Data Requirements
+
+Extract 3 years of historical data minimum:
+- 10-K provides 3 years of IS/CF, 2 years of BS
+- For 3rd year BS, pull from prior year's 10-K
+- Use 10-Qs to fill in quarterly granularity if needed
+
+### Data Extraction Checklist
+
+- Identify reporting currency and scale (thousands, millions)
+- 3 years historical Income Statement
+- 3 years historical Cash Flow Statement
+- 3 years historical Balance Sheet
+- Verify IS Net Income = CF starting Net Income (each year)
+- Verify BS Cash = CF Ending Cash (each year)
+- Extract debt maturity schedule from notes
+- Extract D&A detail or useful life assumptions
+- Note any non-recurring / one-time items to normalize
+
+### Handling Common Filing Variations
+
+| Variation | How to Handle |
+|-----------|---------------|
+| D&A embedded in COGS/SG&A | Pull D&A from Cash Flow Statement |
+| "Other" line items are material | Check notes for breakdown |
+| Restatements | Use restated figures, note in assumptions |
+| Fiscal year ≠ calendar year | Label with fiscal year end (e.g., FYE Jan 2025) |
+| Non-USD reporting currency | Adapt model currency to match filing |