chore: name the product "agent" in README prose

[indykish]

Aligns the skills README with the user-facing terminology rename in usezombie (M82_002): the product noun is agent, not "zombie".

Three prose lines in README.md updated ("inspect agents", "platform-ops agent", "Setting up an agent"). Brand (usezombie), CLI (zombiectl), and the skill name usezombie-install-platform-ops are unchanged.

🤖 Generated with Claude Code

Greptile Summary

This PR updates three prose lines in README.md to replace "zombie" (the product noun) with "agent", aligning documentation with a product terminology rename. Brand name (usezombie), CLI (zombiectl), and skill identifiers are intentionally left unchanged.

• Three occurrences of "zombie" as a product noun are renamed to "agent" across the skill description and bullet list.
• The tagline on line 9 ("install, drive, and operate zombies") appears to have been missed and still uses the old term.

Confidence Score: 4/5

Safe to merge; changes are documentation-only with no impact on code or runtime behaviour.

The tagline on line 9 still reads "operate zombies", which is inconsistent with the stated rename goal and the three other lines that were updated. Everything else looks correct and intentional per the PR description.

README.md line 9 — the hero tagline was not updated alongside the three other prose changes.

Important Files Changed

Filename	Overview
README.md	Three prose occurrences of "zombie" (as a product noun) renamed to "agent"; one additional prose instance on line 9 ("operate zombies") appears to have been missed.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[PR: rename product noun in README] --> B{Term type}
    B -->|Product noun prose| C[zombie → agent]
    B -->|Brand name| D[usezombie — unchanged]
    B -->|CLI tool| E[zombiectl — unchanged]
    B -->|Skill name| F[usezombie-install-platform-ops — unchanged]
    C --> G["inspect agents ✓"]
    C --> H["platform-ops agent ✓"]
    C --> I["Setting up an agent ✓"]
    C --> J["operate zombies ⚠️ (line 9, not updated)"]

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Comments Outside Diff (1)

1. README.md, line 9 (link)

   The tagline on line 9 still uses "zombies" as a product noun — the same pattern that was renamed in the three lines below. This looks like an oversight given the stated goal of aligning all prose to the "agent" terminology.

   Prompt To Fix With AI

   This is a comment left during a code review.
   Path: README.md
   Line: 9
   
   Comment:
   The tagline on line 9 still uses "zombies" as a product noun — the same pattern that was renamed in the three lines below. This looks like an oversight given the stated goal of aligning all prose to the "agent" terminology.
   
   
   
   How can I resolve this? If you propose a fix, please make it concise.

   Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!

Prompt To Fix All With AI

Fix the following 1 code review issue. Work through them one at a time, proposing concise fixes.

---

### Issue 1 of 1
README.md:9
The tagline on line 9 still uses "zombies" as a product noun — the same pattern that was renamed in the three lines below. This looks like an oversight given the stated goal of aligning all prose to the "agent" terminology.

```suggestion
**Agent skills for usezombie — install, drive, and operate agents from any AI coding host.**
```

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