Stop the skills from producing a README alongside the deck or doc

[glukicov]

What this changes, and why

Step 6 told the agent to write or extend a shared README.md next to every deck, one
section per deck in the folder. That file was the only artifact of a build that carried no
citations, so it was the one thing check.py could not keep honest, and it went stale the
first time a deck was edited by a follow-up request. It also gave a build two outputs to
coordinate: the intake had to negotiate the folder's readme conventions, and Step 0 read
that readme to learn local conventions instead of reading an actual deck.

A build now leaves exactly one file behind: the deck (plus a PDF if asked for).

• Step 6 says so explicitly, and everything the readme section used to hold (what the
  deck covers, slide count, navigation keys, and the paragraph on how the file is
  structured for later edits) is reported in the final message instead. Adding a deck to
  an index the repo already keeps becomes the user's call rather than a default.
• Markdown mode (references/markdown.md) carries the same rule, so a cited doc no
  longer grows an uncited neighbour either.
• Step 0 learns local conventions by opening an existing deck (its title slide, theme
  and build stamp), not its folder readme.
• Intake item 6 drops the readme negotiation; Step 4 cleanup now expects nothing
  but the deck and an optional PDF.
• The demo deck's pipeline slide said "README section written" as the ship step; it now
  says the deck is the only file left behind.

Nothing about the citation mechanism, the scripts, or the templates changes.

How you know it works

The whole gate is green locally: ruff check, ruff format --check, ty check, pytest
(91 passed), and validate.py. Both citation guards still report every citation CURRENT,
on uv and on bare python3, for the HTML deck and the Markdown doc.

The demo deck edit lands on a flow box, so it needed a look rather than a checker:
rendered slide 4 at 1280x720 and viewed it. The longer label wraps to two lines inside its
box with no overflow, no clipping against the nav pill, and the row keeps its shape.
smoke_test.py itself does not run in this environment: it deliberately keeps Chrome's
sandbox, which refuses to start as root, so CI's run is the full-deck pass.

Checks that are easy to miss

• No new import in skills/slideops/scripts/. Those two files are untouched.
• dist/skill-demo.pdf is not in the diff.
• Ships a change to users: .claude-plugin/plugin.json and the skill's
  metadata.version both go to 1.1.2, with a CHANGELOG entry.
• The deck changed: slide 4 re-rendered and viewed. The title slide did not move, so
  scripts/make_hero.py output is unaffected.
• No em dashes in prose.

🤖 Generated with Claude Code

https://claude.ai/code/session_01Nyxj8LM1DHDm2i2k2MYGDs

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Generated by Claude Code