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    <lastmod>2026-05-19</lastmod>
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  <!-- About — nav updated · stats 348/v9.2 · Pegasus4i added · May 19, 2026 -->
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    <loc>https://signal4i.ai/about.html</loc>
    <lastmod>2026-05-19</lastmod>
    <changefreq>monthly</changefreq>
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  <!-- Why Signal4i — founding document · Vol. 1 equivalent · May 7, 2026 -->
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    <loc>https://signal4i.ai/why-signal4i.html</loc>
    <lastmod>2026-05-07</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.85</priority>
  </url>

  <!-- ═══════════════════════════════════════════════════
       SIGNAL INDEX — Vol. 1–8 arc
       Vol. 1 = why-signal4i.html (founding document)
       Vol. 4 = not yet published
       ═══════════════════════════════════════════════════ -->

  <!-- Signal Index — Vol. 2 · The Posture Problem · March 13, 2026 -->
  <url>
    <loc>https://signal4i.ai/vol-2.html</loc>
    <lastmod>2026-05-19</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.9</priority>
  </url>

  <!-- Signal Index — Vol. 3 · The Architecture Signal · March 15, 2026 -->
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    <loc>https://signal4i.ai/vol-3.html</loc>
    <lastmod>2026-05-19</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.9</priority>
  </url>

  <!-- Signal Index — Vol. 4 · The Execution Signal · May 2026 -->
  <url>
    <loc>https://signal4i.ai/vol-4.html</loc>
    <lastmod>2026-05-19</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.9</priority>
  </url>

  <!-- Signal Index — Vol. 5 · The Tandem Signal · March 29, 2026 -->
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    <loc>https://signal4i.ai/vol-5.html</loc>
    <lastmod>2026-05-19</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.9</priority>
  </url>

  <!-- Signal Index — Vol. 6 · The Posture Blueprint · April 4, 2026 -->
  <url>
    <loc>https://signal4i.ai/vol-6.html</loc>
    <lastmod>2026-05-19</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.9</priority>
  </url>

  <!-- Signal Index — Vol. 7 · The Decision Window · April 14, 2026 -->
  <url>
    <loc>https://signal4i.ai/vol-7.html</loc>
    <lastmod>2026-05-19</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.9</priority>
  </url>

  <!-- Signal Index — Vol. 8 · The Room · April 18, 2026 -->
  <url>
    <loc>https://signal4i.ai/vol-8.html</loc>
    <lastmod>2026-05-19</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.92</priority>
  </url>

  <!-- ═══════════════════════════════════════════════════
       CONTENT INDEX PAGES (new)
       ═══════════════════════════════════════════════════ -->

  <!-- Signal Index archive — Vol. 1–8 arc + Signal Briefs · May 19, 2026 -->
  <url>
    <loc>https://signal4i.ai/signal-index.html</loc>
    <lastmod>2026-05-19</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.95</priority>
  </url>

  <!-- Field Notes index — all field notes in one place -->
  <url>
    <loc>https://signal4i.ai/field-notes.html</loc>
    <lastmod>2026-05-19</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.92</priority>
  </url>

  <!-- Signal Briefs index -->
  <url>
    <loc>https://signal4i.ai/signal-briefs.html</loc>
    <lastmod>2026-05-19</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.92</priority>
  </url>

  <!-- ═══════════════════════════════════════════════════
       SILVER LAKE SERIES
       Hub + Installments 1–2 live · 3–6 through October
       ═══════════════════════════════════════════════════ -->

  <!-- Silver Lake Series Hub — 6-part arc May–October 2026 -->
  <url>
    <loc>https://signal4i.ai/silverlake-series.html</loc>
    <lastmod>2026-05-19</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.95</priority>
  </url>

  <!-- Silver Lake — Installment 1 · The Coordination Tax · May 2, 2026 -->
  <url>
    <loc>https://signal4i.ai/silverlake.html</loc>
    <lastmod>2026-05-15</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.85</priority>
  </url>

  <!-- Silver Lake — Installment 2 · The Layer That Doesn't Commoditize · May 19, 2026 -->
  <url>
    <loc>https://signal4i.ai/silverlake-2.html</loc>
    <lastmod>2026-05-19</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.9</priority>
  </url>

  <!-- ═══════════════════════════════════════════════════
       SIGNAL BRIEFS
       ═══════════════════════════════════════════════════ -->

  <!-- Signal Brief — Issue 1 · IBM Think 2026 · The Blueprint · May 6, 2026 -->
  <url>
    <loc>https://signal4i.ai/signal-brief-01.html</loc>
    <lastmod>2026-05-06</lastmod>
    <changefreq>monthly</changefreq>
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  <!-- Signal Brief — Org Readiness Edition · IBM IBV 2026 CEO Study · May 8, 2026 -->
  <url>
    <loc>https://signal4i.ai/signal-brief-org-readiness.html</loc>
    <lastmod>2026-05-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.9</priority>
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  <!-- ═══════════════════════════════════════════════════
       FIELD NOTES
       TODO: Standardize URLs to /signal4i-field-note-NN.html
       Current naming is inconsistent — see _redirects for cleanup plan
       ═══════════════════════════════════════════════════ -->

  <!-- Field Note 02 — The CapEx Reckoning · IBM i Read · April 23, 2026 -->
  <!-- Migrated from Substack /p/the-capex-reckoning · May 19, 2026 -->
  <url>
    <loc>https://signal4i.ai/signal4i-field-note-02.html</loc>
    <lastmod>2026-05-19</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.88</priority>
  </url>

  <!-- Field Note v5 — OpenAI pointed agents at IBM i · Agentic traffic alert · May 19, 2026 -->
  <!-- TODO: Redirect to /signal4i-field-note-05.html once standardized -->
  <url>
    <loc>https://signal4i.ai/signal4i-field-note-v5.html</loc>
    <lastmod>2026-05-19</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.88</priority>
  </url>

  <!-- Field Note 07 — Partners, Not Employees · Bolt-On Problem · May 9, 2026 -->
  <url>
    <loc>https://signal4i.ai/signal4i-field-note-07.html</loc>
    <lastmod>2026-05-09</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.85</priority>
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  <!-- Field Note v4 — IBM Cyber Fraud / KD Reduction Engine · May 6, 2026 -->
  <!-- TODO: Redirect to /signal4i-field-note-04v.html or renumber -->
  <url>
    <loc>https://signal4i.ai/signal4i-field-note-v4.html</loc>
    <lastmod>2026-05-06</lastmod>
    <changefreq>monthly</changefreq>
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  <!-- Field Note 06 — The Model Passed Review. Your Deployment Didn't. · May 5, 2026 -->
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    <lastmod>2026-05-05</lastmod>
    <changefreq>monthly</changefreq>
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  <!-- Field Note 05 — The Number Changed · CapEx Revision · May 4, 2026 -->
  <!-- TODO: Rename from signal4i_field_note_v3.html (underscores) + redirect -->
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    <lastmod>2026-05-04</lastmod>
    <changefreq>monthly</changefreq>
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  <!-- Field Note 04 — The Knowledge Distance Problem · KD framework · May 1, 2026 -->
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    <lastmod>2026-05-08</lastmod>
    <changefreq>monthly</changefreq>
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  </url>

  <!-- ═══════════════════════════════════════════════════
       REFERENCE / FRAMEWORK PAGES
       Valuable content — linked from articles, not in primary nav
       ═══════════════════════════════════════════════════ -->

  <!-- Signal Stack — v9.2 · 348 signals · 17 categories -->
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    <loc>https://signal4i.ai/signal-stack.html</loc>
    <lastmod>2026-05-19</lastmod>
    <changefreq>weekly</changefreq>
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  <!-- The Internal FDE — WSJ validation · KD Problem · Cat 13+17 · May 14, 2026 -->
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    <lastmod>2026-05-14</lastmod>
    <changefreq>monthly</changefreq>
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  <!-- Tech Map — IBM i AI technology landscape · May 15, 2026 -->
  <url>
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    <lastmod>2026-05-15</lastmod>
    <changefreq>monthly</changefreq>
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  <!-- IBM BOB Reference — Slash command architecture · Cat 16 · May 15, 2026 -->
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    <loc>https://signal4i.ai/ibm-bob-reference.html</loc>
    <lastmod>2026-05-15</lastmod>
    <changefreq>monthly</changefreq>
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  <!-- White Paper — Speed to Intelligence · Q2 2026 -->
  <url>
    <loc>https://signal4i.ai/speed-to-intelligence.html</loc>
    <lastmod>2026-05-07</lastmod>
    <changefreq>monthly</changefreq>
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  </url>

  <!-- Agent-Ready — Five-Layer Readiness Reference · May 2026 -->
  <url>
    <loc>https://signal4i.ai/agent-ready.html</loc>
    <lastmod>2026-05-19</lastmod>
    <changefreq>monthly</changefreq>
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  <!-- Two Walls Model — KD Wall · Adoption Gap · May 19, 2026 -->
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    <loc>https://signal4i.ai/two-walls.html</loc>
    <lastmod>2026-05-19</lastmod>
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  <!-- Agentic Stack — Technical Reference · Five-layer framework · May 15, 2026 -->
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    <lastmod>2026-05-15</lastmod>
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    <priority>0.82</priority>
  </url>

  <!-- Is There a Map? — H layer philosophy · Human-Agentic · May 11, 2026 -->
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    <loc>https://signal4i.ai/signal4i-is-there-a-map.html</loc>
    <lastmod>2026-05-11</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.82</priority>
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  <!-- Human-Agentic Shift — Org Readiness Framework visual · May 11, 2026 -->
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    <loc>https://signal4i.ai/human-agentic-shift.html</loc>
    <lastmod>2026-05-11</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.78</priority>
  </url>

  <!-- ═══════════════════════════════════════════════════
       EVENT / SESSION CONTENT
       ═══════════════════════════════════════════════════ -->

  <!-- PowerUp 2026 wrap-up · April 30, 2026 -->
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    <lastmod>2026-04-30</lastmod>
    <changefreq>monthly</changefreq>
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  <!-- PowerUp 2026 Session · Most Valuable Person in the AI Economy · April 29, 2026 -->
  <!-- TODO: Rename from signal4i_story_V18.html (underscores + version number) + redirect -->
  <url>
    <loc>https://signal4i.ai/signal4i_story_V18.html</loc>
    <lastmod>2026-04-29</lastmod>
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  <!-- HOT Framework — COMMON AI Initiative community readiness standard · May 2026 -->
  <url>
    <loc>https://signal4i.ai/signal4i-hot-framework.html</loc>
    <lastmod>2026-05-21</lastmod>
    <changefreq>monthly</changefreq>
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  <!-- Agentic Tech Map Companion — Orientation for IBM i practitioners · May 2026 -->
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    <loc>https://signal4i.ai/signal4i-agentic-tech-map-companion.html</loc>
    <lastmod>2026-05-21</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
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