[rongzhichen]

Fixes #1987

What changed

• Updated the documentation checker's tool-name matcher to recognize
  context, impact, link, path, and tests.
• Updated its expected server tool set to those five tools.
• Corrected both README MCP tool counts from four to five.
• Corrected release-validation coverage to six language engines,
  including HTML/CSS.
• Bumped the release version to 0.2.1 using the repository's version helper.

Recognizing context lets the checker associate source=True with context,
rather than with the preceding tests tool.

Why the goldens moved, or why they did not

No golden files moved. This change updates documentation and its checker;
it does not modify parser extraction or engine resolution rules.

Evidence

Synthetic example:

context(task="example", source=True)

The source argument belongs to context. The previous tool-name matcher
did not recognize context, allowing the argument to be attributed to a
preceding tests mention.

The server's tools/list response was verified to expose:
context, impact, path, link, and tests.

Validation completed:

• AXIOMCODE_NO_REFRESH=1 PYTHONDONTWRITEBYTECODE=1 python3 tests/mcp_docs.py
  — passed.
• bash .github/scripts/version-gate.sh origin/dev
  — passed; all 10 version locations agree on 0.2.1.

Checklist

• The three suites pass locally against the parser commit in .github/parser-ref
• Any golden that moved is explained above
• A fix validated on more than one shape, so this is not overfitting to one case
• Labels set, including the front end (java / python / typescript)

[swapnilpaliwal-sd]

Can you open this PR against the branch 0.2.1?