fix: clean YAML frontmatter output

[gotalab]

Description & Motivation

skillport meta set was rewriting YAML frontmatter into JSON-like quoted keys (e.g., "name":) and wrapping long strings using \\ line continuations.
This PR fixes the frontmatter writer so SKILL.md remains clean, readable YAML.

Also bumps non-root package versions to 1.1.0 (next planned version).

Changes

• Fix frontmatter serialization to avoid quoted keys and \\ continuations
• Add unit test coverage for frontmatter formatting
• Bump packages/skillport-core and packages/skillport-mcp versions to 1.1.0 and update pinned deps

How to Test

uv run ruff check .
uv run pytest -q
SKILLPORT_SKILLS_DIR=.skills SKILLPORT_EMBEDDING_PROVIDER=none uv run verify_server.py

Checklist

• Lint passes
• Tests pass
• Docs updated (if behavior changed)

[Copilot]

Pull request overview

This PR fixes YAML frontmatter output formatting and prepares for a 1.1.0 release by bumping package versions and updating path conventions.

Key Changes:

• Implements clean YAML frontmatter output without JSON-like quoted keys or line wrapping
• Adds test coverage for frontmatter formatting
• Bumps skillport-core and skillport-mcp to version 1.1.0
• Standardizes skills directory path from .agent/skills to .skills
• Adds new experimental skills (skill-evaluator, opus-4-5-migration, git-branch-cleanup)
• Removes deprecated .agent/skills content

Reviewed changes

Copilot reviewed 91 out of 102 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/skillport-core/src/skillport/interfaces/cli/commands/meta.py	Core YAML frontmatter formatting fix with intelligent string quoting
tests/unit/test_meta_frontmatter_format.py	New test preventing regression of YAML formatting issues
packages/skillport-core/pyproject.toml	Version bump to 1.1.0
packages/skillport-mcp/pyproject.toml	Version bump to 1.1.0 and dependency update
pyproject.toml	Root package version and workspace configuration updates
uv.lock	Lock file updates for version changes and workspace members
tests/unit/*.py	Test file updates for new .skills path convention
guide/*.md	Documentation updates for new path convention
.skills/experimental/*	New experimental skills added (evaluator, migration, cleanup)
.agent/skills/*	Deprecated skill files removed

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