fix: align pdf_form_filler and evm_tx_handler manifest names with reg…

[rosspeili]

Summary

Aligns the last two legacy short manifest names with registry paths (#101 Option A):

• office/pdf_form_filler — was pdf_form_filler
• defi/evm_tx_handler — was evm_tx_handler

Gemini/Claude tool names now use the full ID (e.g. office/pdf_form_filler). OpenAI/DeepSeek use sanitized names (office_pdf_form_filler, defi_evm_tx_handler).

Fixes #201

Changes

• Manifests — name set to category/skill_name for both skills
• Examples — PDF scripts dispatch via bundle["manifest"]["name"] (evm examples already did)
• Tests — bundle + maintainer manifest assertions; CLI fixtures use full IDs
• Docs — skill catalog pages, CONTRIBUTING, cli.md, agent_loops.md, introduction.md
• CHANGELOG — [Unreleased] entry

Out of scope

• Loader strict validation (#201 follow-up)
• Category moves (#53)

Type of change

• Bug Report Fix — manifest / tool-name identity drift
• Doc Fix — naming and dispatch guidance

Checklist

• Agent Code of Conduct
• pytest skills/office/pdf_form_filler/test_skill.py skills/defi/evm_tx_handler/test_skill.py
• pytest tests/test_cli.py tests/test_registry_docs.py tests/skills/office/test_pdf_form_filler.py
• skillware list / skillware test for both skills
• CHANGELOG.md updated

New or updated skill

Manifest metadata + docs/examples only — no new skills, no logic changes.

• manifest.yaml name matches folder path
• Examples use manifest-derived tool dispatch
• test_skill.py + catalog docs updated
• SkillLoader.load_skill(...) unchanged (path-based)

Related

Fixes #201 · Related #101, #178