feat: npx sem-skill installer (one-command agent setup)

[rs545837]

Rides the agent ecosystem , the cheapest way to turn agent users into sem users.

npx @ataraxy-labs/sem-skill

One command installs the sem skill into ~/.claude/skills/ and registers the sem MCP server, so a coding agent (Claude Code) picks up sem , impact / context / orient / diff over grep for structural questions , with no manual MCP wiring. Idempotent.

• Distributes the canonical skill from feat(skill): add sem semantic version control skill #376 (a prepack copies skills/sem/SKILL.md, single source of truth; credit to @linhlban150612).
• The skill is extended with sem orient / sem_entities query and sem context --hops so it reflects current capabilities.

Verified the installer end to end (skill installed, MCP detected, idempotent re-run).

Not published to npm yet , that's a separate npm publish once you approve.

[inspect-review]

inspect review

Triage: 35 entities analyzed | 0 critical, 0 high, 0 medium, 35 low
Verdict: standard_review

Findings (2)

1. [low] install.mjs line 55: Regex pattern /^sem[:\s]/m will fail to match 'sem' if it appears at the start of a line without a colon or space immediately after. The MCP list output likely shows 'sem' as a standalone word or with different formatting, causing the installer to incorrectly attempt re-registration even when sem is already registered.
2. [low] Race condition: execFileSync('claude', ['mcp', 'list']) output is checked with regex /^sem[:\s]/m which only matches if 'sem' appears at the start of a line. If the MCP server is named 'sem' but appears mid-line in the output (e.g., 'user: sem'), the regex will fail to match and the code will attempt to re-register an already registered server, potentially causing an error.

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Reviewed by inspect | Entity-level triage found 0 high-risk changes