Silence render-disposed spam, unbreak bundled skills, drop board wake

Three independently ugly bugs that all fed the same log flood:

* Electron's `WebFrameMain.send` writes every "Render frame was disposed"
  to stderr via `console.error`. When the worker fans a second
  agent-event past a reloading renderer, we produced thousands of
  identical lines and stalled the main loop on stderr I/O. Added a
  `mainFrame.detached` guard so the send is short-circuited before
  Electron's own catch block fires, and installed a targeted filter in
  `suppress-warnings.ts` (now actually imported from the entry point)
  so the specific `console.error("Error sending from webFrameMain:"…)`
  noise never reaches the terminal. Any other payload still surfaces.

* `dispatchAgentMessage` accepted the human-reader sentinel as a wake
  target when an agent replied to `__board__` — `wakeAgentIfPossible`
  then called `db.getAgent("__board__")`, threw, and the dispatcher
  kept repeating on every send. Strip `HUMAN_SENDER_ID` at
  `resolveMessageWakeTargets`, and keep a defense-in-depth guard in the
  heartbeat so a stray caller (future automation fan-out) cannot
  reintroduce the crash.

* Pi's skills loader rejects any SKILL.md whose frontmatter `name`
  diverges from its parent directory. The four bundled `my-writing-style`
  copies declared `name: writing-style-skill`, so every install emitted
  a warning and dropped the skill. They also lived as orphan gitlinks
  (mode 160000 without .gitmodules), and the global `*.md` gitignore
  hid every other SKILL.md from version control. Fixed the frontmatter
  to match the dir, converted the dangling submodules to plain trees,
  and allowlisted `builtin-skills/**/*.md` so a fresh clone carries the
  catalogue instead of silently losing it.

builtin-skills/software-engineer/clean-architecture/references/entity-value-objects.md

@@ -0,0 +1,100 @@
+---
+title: Use Value Objects for Domain Concepts
+impact: HIGH
+impactDescription: eliminates primitive obsession, enforces constraints
+tags: entity, value-objects, domain, types
+---
+
+## Use Value Objects for Domain Concepts
+
+Replace primitive types with value objects that encapsulate validation and behavior. Value objects are immutable, compared by value, and self-validating.
+
+**Incorrect (primitive obsession):**
+
+```typescript
+class Customer {
+  constructor(
+    public id: string,
+    public email: string,
+    public phone: string,
+    public postalCode: string
+  ) {}
+
+  changeEmail(newEmail: string): void {
+    // Validation scattered or missing
+    if (!newEmail.includes('@')) {
+      throw new Error('Invalid email')
+    }
+    this.email = newEmail
+  }
+}
+
+// Callers can pass any string
+const customer = new Customer('123', 'not-an-email', '123', 'invalid')
+```
+
+**Correct (value objects for domain concepts):**
+
+```typescript
+class Email {
+  private constructor(private readonly value: string) {}
+
+  static create(value: string): Email {
+    if (!Email.isValid(value)) {
+      throw new InvalidEmailError(value)
+    }
+    return new Email(value.toLowerCase())
+  }
+
+  private static isValid(value: string): boolean {
+    return /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(value)
+  }
+
+  equals(other: Email): boolean {
+    return this.value === other.value
+  }
+
+  toString(): string {
+    return this.value
+  }
+}
+
+class PhoneNumber {
+  private constructor(
+    private readonly countryCode: string,
+    private readonly number: string
+  ) {}
+
+  static create(countryCode: string, number: string): PhoneNumber {
+    // Validation and normalization
+    return new PhoneNumber(countryCode, number.replace(/\D/g, ''))
+  }
+}
+
+class Customer {
+  constructor(
+    public readonly id: CustomerId,
+    private email: Email,
+    private phone: PhoneNumber
+  ) {}
+
+  changeEmail(newEmail: Email): void {
+    this.email = newEmail  // Already validated
+  }
+}
+
+// Compile-time type safety + runtime validation
+const customer = new Customer(
+  CustomerId.create('123'),
+  Email.create('user@example.com'),
+  PhoneNumber.create('+1', '555-1234')
+)
+```
+
+**Benefits:**
+- Invalid values cannot exist in the system
+- Domain concepts explicitly named in code
+- Validation logic centralized and reusable
+- Type system prevents mixing up string parameters
+
+Reference: [Value Object Pattern](https://martinfowler.com/bliki/ValueObject.html)