feat: make examples cumulative with carry-forward chain and capstone

Add three new sections to all 14 examples:
- "Carry Forward": what output feeds into later examples (01-10)
- "The Cumulative Path": alternative prompt building on previous output (02-10)
- "Now Try It Yourself": personalized template with transferable pattern (all)
- "Building On" callout connecting back to previous examples (02-10)

Add Example 14: Build Your Personal Agent - capstone that guides reader
through writing their own CLAUDE.md, creating a personal skill, connecting
a messaging channel, setting up automation, and testing end-to-end.

Update README with cumulative path diagram, two usage modes, and example 14.
Update GETTING-STARTED.md with cross-references to relevant examples.

17 files changed, 703+ lines added. The examples now form a coherent
learning path from "see what it can do" to "build your own agent."

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

examples/01-agent-runtime/prompt.md

@@ -76,3 +76,37 @@ The difference is only scale.
 
 Claude Code v2.1.84 added adaptive thinking, which adjusts reasoning depth
 automatically. Complex sub-tasks get more thought; simple ones proceed fast.
+
+---
+
+## Carry Forward
+
+You just built `research-output.md`. Hold onto it.
+
+- **Example 02** organizes raw output like this into a structured project
+- **Example 06** sends research through a multi-agent review cycle
+- **Example 10** uses this exact capability as step 1 of a full pipeline
+
+Every example builds on the same core loop: Claude plans, executes tools, observes results, and repeats until done. The task changes. The pattern does not.
+
+---
+
+## Now Try It Yourself
+
+The demo researched AI frameworks. Replace the topic with something you actually need:
+
+```
+Research the top 3 [your topic] this [time period]. For each, include:
+- [what you need to know]
+- [specific data points: URLs, numbers, dates]
+- Your verdict on [your evaluation criteria]
+
+Write the summary to research-output.md with a ranked Verdict section at the end.
+```
+
+**The pattern you just learned:** research question + output structure + file destination. Claude handles everything between the question and the written answer.
+
+Ideas worth trying:
+- Competitors in your market and their latest announcements
+- Tools for a workflow you want to improve
+- Developments in a technology you are evaluating for work