fix(enrichment): don't crash on a missing optional mcp.json or skills/ dir

[mftnakrsu]

What

loadMcpTools and loadSkills (toolbox/enrichment/src/agent/tools.ts) crash kcagent enrich when their optional config inputs are absent.

Why

Both functions call fs.promises.stat() outside their try blocks:

const stat = await fs.promises.stat(mcpConfigPath); // rejects ENOENT if absent
if (!stat.isFile()) return [];                       // dead code for missing path
try { ... } catch { return []; }

fs.promises.stat rejects with ENOENT for a missing path, so a missing mcp.json / skills/ dir throws an uncaught ENOENT up through enrichCommand, aborting the run — and the !isFile()/!isDirectory() guards never get a chance to return [].

Change

Move both stat() calls inside the existing try blocks and treat ENOENT as "not configured" (return [] silently; other errors still warn). This matches the catch blocks' existing return-[] intent and keeps these inputs genuinely optional.

Verification

npx tsc --noEmit type-checks the changed file clean. The only diagnostics in a fresh checkout are pre-existing TS2307: Cannot find module 'kcmd' in agent.ts/command.ts from the unbuilt local file:../mdcode dependency — unrelated to this change.

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