fix(local-inference): stage flat bionic bundles

[lalalune]

Summary

• Refs Android bionic inference host can't locate the staged model: deriveBundleDir requires text/ layout but models stage flat #11335 by making BionicHostLoader derive a real fused bundle root for flat staged Eliza-1 GGUFs.
• When a curated eliza-1-*.gguf is staged flat under local-inference/models/, the loader now creates a hidden .bionic-bundles/<model>/text/<model>.gguf hardlink/symlink view and sends that bundle root to the Android bionic host.
• Keeps arbitrary flat GGUFs on the old host-default path and keeps ASR gated on real ASR bundle files/provenance.

Evidence

• git fetch origin + git rebase origin/develop completed cleanly after origin/develop moved to 26724fc8019.
• bun run --cwd plugins/plugin-local-inference test -- src/services/bionic-host-loader.test.ts -> 4 passed, 9 skipped on macOS (Linux-only abstract-UDS tests skipped as expected).
• bunx biome check plugins/plugin-local-inference/src/services/bionic-host-loader.ts plugins/plugin-local-inference/src/services/bionic-host-loader.test.ts -> clean.
• bun run --cwd packages/contracts build && bun run --cwd plugins/plugin-local-inference typecheck -> clean.
• bun run --cwd plugins/plugin-local-inference build -> clean.
• git diff --check origin/develop...HEAD -> clean.
• bun run verify -> clean; Turbo build/typecheck completed 483/483 tasks, follow-up audits passed, and 28 dist-path consumer configs typechecked.

Not run / N/A

• Android Pixel bionic-host local-chat smoke, screenshots, and video: still required before closing Android bionic inference host can't locate the staged model: deriveBundleDir requires text/ layout but models stage flat #11335. This Mac verification proves the path derivation and repo gates, but not the real Android hardware lane.
• Real-LLM trajectories, backend logs, frontend logs, domain artifacts: N/A for this code path derivation change; no prompt/model/action/provider behavior or user-facing UI changed.

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[lalalune]

Rebased onto current origin/develop after #11454 merged. New head: 6930b38ccf2.

Focused verification rerun on the rebased branch:

node packages/shared/scripts/generate-keywords.mjs --target ts
bun run --cwd plugins/plugin-local-inference test -- src/services/bionic-host-loader.test.ts
# PASS: 4 passed, 9 skipped (Linux-only IPC tests skipped here)

bunx biome check plugins/plugin-local-inference/src/services/bionic-host-loader.ts plugins/plugin-local-inference/src/services/bionic-host-loader.test.ts
# PASS

The Android device/simulator smoke remains the hardware-gated evidence item already called out in the PR body.

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