Resolve the lexicon agents checkout portably

Probe ../agents, honor AGENTS_CHECKOUT, else ask the operator instead of assuming a machine-specific default path.

Author: TheGreatAxios

plugins/corbits-skills/skills/lexicon/SKILL.md

@@ -25,8 +25,9 @@ Linear issues for drift.
 All comparisons in one run use a single pinned commit of the agents
 checkout — never float mid-run.
 
-1. Resolve the checkout (default `/Users/thegreataxios/abklabs/agents`;
-   accept an operator override path).
+1. Resolve the checkout — probe `../agents` beside this repo, then
+   `$AGENTS_CHECKOUT` when set, else ask the operator for the path.
+   Never assume a machine-specific default.
 2. Record the pin: `git -C <checkout> rev-parse HEAD`.
 3. Read every agents-side file with `git show <pin>:<path>` so local
    working-tree edits cannot skew the diff.

tests/unit/lexicon-skill.test.ts

@@ -33,6 +33,13 @@ describe("lexicon skill shape", () => {
     expect(skill).toContain("linear-issue-workflow");
   });
 
+  test("checkout resolution is portable (no hardcoded machine path)", async () => {
+    const skill = await Bun.file(skillPath).text();
+    expect(skill).not.toMatch(/\/Users\/[\w-]+/);
+    expect(skill).toMatch(/AGENTS_CHECKOUT/);
+    expect(skill).toMatch(/ask the operator/);
+  });
+
   test("lexicon is a slash command", async () => {
     const cmds = await loadSkillCommands(pluginRoot);
     expect(defined(cmds, "skill commands").map((c) => c.name)).toContain(