Deduplicate equivalent graph model configs with compatibility aliases

[ElmoPA]

Replace five identical model copies with thin aliases and express the two Qwen 180M variants through explicit flow-head overrides. Existing callers retain their resolved graph behavior.

This extends the existing graph-contract stack ending at #159. Review the config deduplication and compatibility layer independently of the ARC and weighted-training integration above it. The branch points at the original consolidation commit 67357575; no commit or code was rewritten to create this stack.

Validation: the committed deduplication evidence records unchanged composition for all 254 contexts in this layer. Stack construction verified exact commit identity and parent ancestry. The complete assembled CPU validation and source dispositions are attached to #198; those results apply to the assembled code commit, not separately to every intermediate layer.

Keep this PR in draft pending the assembled real-weight/data OSMO gate and applicable fresh CI/review.

Stack order: #150–#159 → #199 → #200 → #201 → #198.

[ElmoPA]

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• Integrate canonical ARC semantics with graph lifecycle contracts #200 : 2 dependent PRs (#198 , #201 )
• Deduplicate equivalent graph model configs with compatibility aliases #199 👈 (View in Graphite)
• Verify legacy trunk initialization and capability dispositions #159
• Bind deployment recipes to declared frames and token timing #158
• Preserve source parity and reject incompatible model data #157
• Validate retained model recipes on source-pinned OSMO inputs #156
• Enforce recursive configuration and integration CI gates #155
• Bind checkpoints to inference and preprocessing contracts #154
• Restore recorded-data visualization and conversion tools #153
• Restore PI recipes and shared token diagnostics #152
• Restore HPT recipe parity through configured graph stages #151
• Introduce model-owned inference and data/evaluation contracts #150
• main

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