feat(podcast): credit Andrew Pla as host across The PowerShell Podcast

The 220 modern (Podbean-hosted) episodes were migrated with `author: James
Petty` as a placeholder host. The actual host is Andrew Pla, with Jordan
Hammond co-hosting the early episodes. Rewrite host attribution:

- author: -> Andrew Pla (the page byline) on all 220 episodes
- authors: -> Andrew first; Jordan Hammond added to the 97 episodes dated
  on/before 2023-12-25 ("Farewell to Jordan"); existing guests preserved
- 5 episodes where James Petty is the featured guest keep him as a guest and
  add Andrew as host, rather than remapping him away

PowerScripting Podcast episodes (libsyn-hosted) are a separate show and are
left untouched. Adds scripts/rewrite-podcast-authors.ps1 (idempotent, dry-run
by default) plus the design record: CONTEXT.md glossary, the sync plan, and
ADR 0003 on the truncated-feed incremental sync architecture.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Q2NJsYE8nUKKHD25jXiHV1

Author: HeyItsGilbert

CONTEXT.md

@@ -32,3 +32,15 @@ display their author name unchanged.
 The per-Author page at `/authors/<name>/` listing that Author's content and, when
 provided, their self-description. Distinct from the **Author list** — the index page
 at `/authors/` showing every Author as a card.
+
+**The PowerShell Podcast**:
+The current weekly show hosted by Andrew Pla (with Jordan Hammond co-hosting the
+earliest episodes), distributed via the Podbean feed. This is the show that the
+`/podcast/` section is titled after and that the RSS sync keeps in step.
+
+**PowerScripting Podcast**:
+The older, separate show (2007–2020, hosts such as Jonathan Walz and Hal Rottenberg)
+whose archived episodes also live under `/podcast/`. A distinct podcast from **The
+PowerShell Podcast** despite sharing the section — it has its own hosts and is not
+covered by the Podbean feed or the sync. Episodes are told apart by their audio host:
+Podbean (`mcdn.podbean.com`) means The PowerShell Podcast; libsyn means PowerScripting.

content/podcast/2022-03-23-the-power-of-shell-compels-you.md

@@ -1,8 +1,9 @@
 ---
 title: The Power of Shell Compels You
-author: James Petty
+author: Andrew Pla
 authors:
-  - James Petty
+  - Andrew Pla
+  - Jordan Hammond
 date: "2022-03-23T20:27:34+00:00"
 podcast_url: "https://mcdn.podbean.com/mf/web/xwe5xx/PowerShell_Podcast_Episode_19di8t.mp3"
 episode: 1

content/podcast/2022-03-25-chatting-about-chatbots-with-mike-kanakos-microsoft-mvp.md

@@ -1,8 +1,9 @@
 ---
 title: Chatting about Chatbots with Mike Kanakos, Microsoft MVP
-author: James Petty
+author: Andrew Pla
 authors:
-  - James Petty
+  - Andrew Pla
+  - Jordan Hammond
   - Mike Kanakos
 date: "2022-03-25T20:55:45+00:00"
 podcast_url: "https://mcdn.podbean.com/mf/web/vx87gi/PowerShell_Podcast_episode_4aglii.mp3"

content/podcast/2022-03-25-james-friggen-petty-microsoft-mvp.md

@@ -1,7 +1,9 @@
 ---
 title: James ”Friggen” Petty! Microsoft MVP
-author: James Petty
+author: Andrew Pla
 authors:
+  - Andrew Pla
+  - Jordan Hammond
   - James Petty
 date: "2022-03-25T20:49:12+00:00"
 podcast_url: "https://mcdn.podbean.com/mf/web/v6efiq/PowerShell_Podcast_episode_363s8e.mp3"

content/podcast/2022-03-25-stop-typing-so-much.md

@@ -1,8 +1,9 @@
 ---
 title: Stop Typing So Much
-author: James Petty
+author: Andrew Pla
 authors:
-  - James Petty
+  - Andrew Pla
+  - Jordan Hammond
 date: "2022-03-25T20:44:27+00:00"
 podcast_url: "https://mcdn.podbean.com/mf/web/wxt6xb/PowerShell_Podcast_episode_28eklv.mp3"
 episode: 2

content/podcast/2022-04-04-nobody-keeps-a-secret-like-powershell.md

@@ -1,8 +1,9 @@
 ---
 title: Nobody Keeps a Secret Like PowerShell
-author: James Petty
+author: Andrew Pla
 authors:
-  - James Petty
+  - Andrew Pla
+  - Jordan Hammond
 date: "2022-04-04T17:15:00+00:00"
 podcast_url: "https://mcdn.podbean.com/mf/web/4xmzyv/PowerShell_Podcast_episode_57v84l.mp3"
 episode: 5

content/podcast/2022-04-11-dbatools-with-jess-pomfret.md

@@ -1,8 +1,9 @@
 ---
 title: DBATools with Jess Pomfret
-author: James Petty
+author: Andrew Pla
 authors:
-  - James Petty
+  - Andrew Pla
+  - Jordan Hammond
   - Jess Pomfret
 date: "2022-04-11T17:15:00+00:00"
 podcast_url: "https://mcdn.podbean.com/mf/web/kj27aa/PowerShell_Podcast_episode_669dsg.mp3"

content/podcast/2022-04-18-this-title-is-not-psremotely-clever.md

@@ -1,8 +1,9 @@
 ---
 title: This title is not psremotely clever
-author: James Petty
+author: Andrew Pla
 authors:
-  - James Petty
+  - Andrew Pla
+  - Jordan Hammond
 date: "2022-04-18T17:05:00+00:00"
 podcast_url: "https://mcdn.podbean.com/mf/web/j7emjh/PowerShell_Podcast_episode_76aho6.mp3"
 episode: 7

content/podcast/2022-04-25-securing-powershell-with-fred-weinmann.md

@@ -1,8 +1,9 @@
 ---
 title: Securing PowerShell with Fred Weinmann
-author: James Petty
+author: Andrew Pla
 authors:
-  - James Petty
+  - Andrew Pla
+  - Jordan Hammond
   - Fred Weinmann
 date: "2022-04-25T18:00:00+00:00"
 podcast_url: "https://mcdn.podbean.com/mf/web/2pkste/PowerShell_Podcast_episode_87ghwg.mp3"

content/podcast/2022-04-27-powershell-devops-global-summit-powershell-after-dark.md

@@ -1,8 +1,9 @@
 ---
 title: PowerShell & DevOps Global Summit (PowerShell After Dark)
-author: James Petty
+author: Andrew Pla
 authors:
-  - James Petty
+  - Andrew Pla
+  - Jordan Hammond
 date: "2022-04-27T21:00:12+00:00"
 podcast_url: "https://mcdn.podbean.com/mf/web/8qekrj/PowerShell_Summit_PowerShell_After_Dark6dpfr.mp3"
 aliases: