Move the Fable roles to claude-fable-5-1 (0.9.30)

[tlmader]

Summary

Anthropic ships Claude Fable 5.1 under the slug claude-fable-5-1. This PR moves the port's Fable defaults to that slug.

• plugins/pstack/models.json names claude-fable-5-1 in the panel and in bug-fix, perf-issue, hillclimb, and strongest judgment. The available-model entry is relabeled Fable 5.1; Fable 5 leaves the list.
• bun tools/generate.mjs restamped the ## Models sections of poteto-mode, arena, architect, and interrogate, the interrogate reviewer table, and setup-pstack's override sheet and available-model line.
• The README panel row states the new default. CHANGES.md gains a 0.9.30 entry and VERSION moves to 0.9.30.

The upstream pin remains at e8d856f.

Closes #74

Verification

• bun tools/generate.mjs exits 0 and leaves the tree clean.
• 154 tests pass across the ten suites other than tests/worktree-audit.test.mjs.
• tests/worktree-audit.test.mjs times out on all 11 tests on my machine on untouched main as well, so those failures are unrelated to this change.

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🟢 +0 new · 🟠 ~5 changed · 🔴 -0 removed · 1 flow · 10 files · commit aa03d0f

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5 components touched across 6 lanes.

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Model policy update and delegation

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[michael-denyer]

Thank you for this, @tlmader. The issue and PR were exactly the right shape: the change lands in models.json, the generator restamps everything else, and the tree diffs clean against a fresh run on main. Tests and all CI checks pass. Merging now and releasing as 0.9.30. Also I had thought I had already done this so glad you picked it up.