Add CCC Site Kit scripts under site-kit/

[RiCSaucd]

Adds the CCC Site Kit shell scripts and their README to the repository.

What changed

New site-kit/ folder containing, verbatim as supplied:

• build.sh — wires rendered assets and stamps the config onto the engine
• deploy.sh — publishes the built dist/SLUG/ folder to Vercel
• use-stock.sh — copies a stock asset set into work/SLUG/
• README.md — the kit's own documentation

(SLUG above stands in for the slug value read from site.config.mjs.)

They live in a subfolder rather than at the repo root because the root of this
repository is the Claude Code / Hermes connection setup (setup.sh,
.claude/settings.json), which the kit is unrelated to.

The root README.md gains a short site-kit/ section and an updated repository
structure tree.

Notes for review

• Two copies of build.sh were supplied; they are byte-identical, so only one is
  committed.
• The scripts are not runnable as-is from this repository. The kit README
  refers to site.config.mjs, render.mjs, stamp.mjs, and the engine/,
  templates/, render/, reference/, and stock/ folders, none of which are
  present here.
• The scripts assume a macOS shell environment and are committed unmodified, so
  these are carried over as-is rather than fixed: #!/bin/zsh shebangs, and
  build.sh calls sips (macOS only) along with ffmpeg, ffprobe, and bc
  without checking they are installed. build.sh also does no error handling if
  ffprobe returns an empty duration, which would make the bc fps computation
  fail confusingly.

Happy to follow up with a portability pass if that is wanted.

[coderabbitai]

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