fix(tui): clickable hyperlinks and skill slash command dispatch

Two TUI fixes:

1. Hyperlinks are now clickable (Cmd+Click / Ctrl+Click) in terminals
   that support OSC 8.  The markdown renderer was rendering links as
   plain colored text — now wraps them in the existing <Link> component
   from @hermes/ink which emits OSC 8 escape sequences.

2. Skill slash commands (e.g. /hermes-agent-dev) now work in the TUI.
   The slash.exec handler was delegating to the _SlashWorker subprocess
   which calls cli.process_command().  For skills, process_command()
   queues the invocation message onto _pending_input — a Queue that
   nobody reads in the worker subprocess.  The skill message was lost.
   Now slash.exec detects skill commands early and rejects them so
   the TUI falls through to command.dispatch, which correctly builds
   and returns the skill payload for the client to send().

ui-tui/src/__tests__/createSlashHandler.test.ts

@@ -121,6 +121,37 @@ describe('createSlashHandler', () => {
     expect(createSlashHandler(ctx)('/h')).toBe(true)
     expect(ctx.transcript.panel).toHaveBeenCalledWith(expect.any(String), expect.any(Array))
   })
+
+  it('falls through to command.dispatch for skill commands and sends the message', async () => {
+    const skillMessage = 'Use this skill to do X.\n\n## Steps\n1. First step'
+
+    const ctx = buildCtx({
+      gateway: {
+        gw: {
+          getLogTail: vi.fn(() => ''),
+          request: vi.fn((method: string) => {
+            if (method === 'slash.exec') {
+              return Promise.reject(new Error('skill command: use command.dispatch'))
+            }
+
+            if (method === 'command.dispatch') {
+              return Promise.resolve({ type: 'skill', message: skillMessage, name: 'hermes-agent-dev' })
+            }
+
+            return Promise.resolve({})
+          })
+        },
+        rpc: vi.fn(() => Promise.resolve({}))
+      }
+    })
+
+    const h = createSlashHandler(ctx)
+    expect(h('/hermes-agent-dev')).toBe(true)
+    await vi.waitFor(() => {
+      expect(ctx.transcript.sys).toHaveBeenCalledWith('⚡ loading skill: hermes-agent-dev')
+    })
+    expect(ctx.transcript.send).toHaveBeenCalledWith(skillMessage)
+  })
 })
 
 const buildCtx = (overrides: Partial<Ctx> = {}): Ctx => ({