docs: fix 27 stale claims found in documentation audit

[jqnatividad]

• Update 7 files with stale version 17.0.0 → 18.0.0
• Update 5 files with stale component counts (3/6/2 → 5/8/3 skills/commands/agents)
• Update 6 files with stale command counts (68/60 → 70/62 for qsv/qsvmcp)
• Update 2 project structure trees (add 6 missing src files, fix cowork-setup.cjs)
• Fix SKILLS_API.md category table (remove non-existent grep/apply/flatten/to skills)
• Fix emoji conventions in skills/CLAUDE.md to show actual emoji prefixes
• Add undocumented QSV_MCP_ENABLE_APPS to ENVIRONMENT_VARIABLES.md
• Fix plugin.json description count (52 → 51 skill-based commands)
• Fix completions/CLAUDE.md count (66 → 69, remove non-existent generate command)

[Copilot]

Pull request overview

Updates multiple documentation and guidance files to reflect the current qsv/qsvmcp + MCP ecosystem (version bump to 18.0.0, refreshed component/tool/command counts, corrected skills tables, and newly documented MCP env var).

Changes:

• Refreshes version references (17.0.0 → 18.0.0) across docs.
• Updates stated counts for skills/commands/agents and corrects skills category listings and emoji conventions.
• Documents QSV_MCP_ENABLE_APPS and updates MCP/extension/plugin docs accordingly.

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
docs/PERFORMANCE.md	Updates example qsv --version output and narrative to 18.0.0.
docs/ENVIRONMENT_VARIABLES.md	Adds QSV_MCP_ENABLE_APPS documentation.
contrib/completions/CLAUDE.md	Updates completions command-count statement.
.serena/memories/codebase_structure.md	Updates MCP-related component counts in the structure tree.
.claude/skills/docs/reference/UPDATE_SYSTEM.md	Updates reference doc version to 18.0.0.
.claude/skills/docs/reference/SKILLS_API.md	Fixes category table to remove non-existent skills and add current ones.
.claude/skills/docs/reference/AUTO_UPDATE.md	Updates reference doc version to 18.0.0.
.claude/skills/docs/guides/WINDOWS_SETUP.md	Updates Cowork plugin component counts and subagent list.
.claude/skills/docs/guides/START_HERE.md	Updates qsvmcp command count claim in the “Two Pieces” table.
.claude/skills/docs/guides/MACOS_SETUP.md	Updates Cowork plugin component counts and subagent list.
.claude/skills/docs/guides/CLAUDE_CODE.md	Updates minimum expected qsv version in setup instructions.
.claude/skills/docs/desktop/README-MCPB.md	Updates qsv/qsvmcp command count claims throughout extension docs.
.claude/skills/README.md	Updates repo tree and “What’s Available” tool-count summary.
.claude/skills/README-MCP.md	Updates qsvmcp vs qsv command-count claims and related narrative.
.claude/skills/CLAUDE.md	Updates emoji conventions and plugin-mode agent count statement.
.claude/skills/.claude-plugin/plugin.json	Updates description command count phrasing (52 → 51 skill-based commands).

Comments suppressed due to low confidence (1)

.claude/skills/README-MCP.md:21

• The docs claim qsvmcp ships with 62 commands and excludes 8 commands, but the source build cargo build --bin qsvmcp -F qsvmcp does not enable the to or ui features, so to and color are also excluded. Based on src/main.rs command gating and the qsvmcp feature set in Cargo.toml, qsvmcp should expose 60 commands (not 62). Please update the counts and excluded-command list (or clarify that release builds enable extra features beyond -F qsvmcp).

The **qsvmcp** binary variant is purpose-built for MCP server use. It includes only the 62 commands needed by the MCP server (vs 70 in the full qsv binary), resulting in a smaller, faster binary.

**Features included in qsvmcp**: Polars, Luau scripting, geocoding, self-update, MCP skill generation (`--update-mcp-skills`), and the `log` command for MCP audit logging.

**Commands excluded from qsvmcp** (not needed for MCP): `apply`, `fetch`, `fetchpost`, `foreach`, `lens`, `prompt`, `python`, and `clipboard` — 8 commands total.