fix: CJK–MyST spacing rule and target-label blank-line cleanup

[mmcky]

Address feedback from lecture-python-programming.zh-cn PR #6 (HumphreyYang).

Changes

1. CJK–MyST spacing rule (zh-cn language config)

New additionalRules entry instructs Claude to always insert a space between Chinese characters and inline MyST directives ({doc}, {ref}, {any}, {term}, etc.) or Markdown links ([text](url)).

Before: 请参阅{doc} — directive may not render
After: 请参阅 {doc} — renders correctly

2. MyST target-label blank-line cleanup (file-processor)

reconstructFromComponents now post-processes the joined document to strip blank lines between MyST target labels ((label)=) and headings. The section separator logic was inserting blank lines that break MyST target-to-heading attachment.

Before:

(paf_generators)=

## 生成器

After:

(paf_generators)=
## 生成器

Files Changed

File	Change
src/language-config.ts	Add spacing rule to zh-cn config
src/file-processor.ts	Post-process to strip blank lines between targets and headings
src/__tests__/language-config.test.ts	Update to expect 2 rules
src/__tests__/component-reconstruction.test.ts	New test for target-label cleanup
CHANGELOG.md	Add unreleased entries
.github/copilot-instructions.md	Update test count 934 → 935

[Copilot]

Pull request overview

This PR updates the translation prompt rules and reconstruction output to prevent MyST rendering issues in zh-cn translations, based on feedback from a downstream translation PR.

Changes:

• Add a zh-cn prompt rule requiring spacing between Chinese text and inline MyST directives / Markdown links.
• Post-process reconstructed documents to remove blank lines between MyST target labels (label)= and the immediately following heading.
• Update/add unit tests and document the changes in the changelog/instructions.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/language-config.ts	Adds a zh-cn-specific additional rule for CJK↔MyST/link spacing to improve rendering correctness.
src/file-processor.ts	Adds post-processing to ensure MyST target labels attach to headings (removes intervening blank line).
src/__tests__/language-config.test.ts	Updates expectations for the added zh-cn rule.
src/__tests__/component-reconstruction.test.ts	Adds regression coverage for target-label/heading blank-line removal.
CHANGELOG.md	Records the new rule, reconstruction fix, and test count update under Unreleased.
.github/copilot-instructions.md	Updates the documented total test count (934 → 935).