Fix and validate rendered guidance examples

[nahiyankhan]

Category: fix
User Impact: Readers see guidance examples that pass the parser used by ghost.

Problem: Two landing-page examples used material globs even though ghost requires explicit file paths.

Solution: Replace those globs with explicit paths and extract the example data so tests parse the same examples that the page renders.

Compatibility: No CLI, package schema, layout, or style changes.

Scope: One of five independent PRs split from the original #291. This branch targets main and contains only this concern, its tests, and its documentation.

Related: Enforce resolved material access boundaries, Preserve guidance meaning in CLI output, Report incomplete guidance loading, Add read-only installed skill checks.

Validation:

• pnpm run quality:all: passed on this standalone branch, including build, package/release checks, tests (229 passed), workspace builds, and package validations.
• Pre-commit checks and git diff origin/main...HEAD --check: passed.
• Fresh dependency installation hit registry checksum errors. Validation used an isolated copy of the existing checkout's dependencies; the lockfile is unchanged.

Changeset: Not needed: private docs-site data and tests only.

ghost Review: Docs review packet assembled. Source inspection found no markup or style changes; the visual check is advisory. Rendered visual verification was not performed. Unbound test/data files and nodes without checks remain coverage gaps. Used the current ghost review --package apps/docs/.ghost --base origin/main --format json and inspected ghost manifest; the older ghost check, --include-memory, and dump:cli-help workflows are unavailable in this checkout.

File changes (3 files)

File	Purpose
apps/docs/src/data/guidance-examples.ts	Extract the examples and replace invalid material globs.
apps/docs/src/pages/index.astro	Import shared example data without changing rendered markup or styles.
packages/ghost/test/docs-examples.test.ts	Validate the rendered examples through the node parser.

Screenshots/Demos: Not captured: example paths and data placement changed, with no layout or style edits.