docs(skills): split graphstore-ingestion into -dsl + -builder

[KailasMahavarkar]

Previous `graphstore-ingestion` skill was 777 lines and mixed two very different audiences: LLMs emitting DSL text at runtime, and Python authors writing adapters with the typed builder. Each LLM session pays the full token cost of both.

Split

New skill	Lines	KB	~Tokens	Audience
`graphstore-dsl`	425	19	5k	LLM runtime. Emits DSL text for parser + execute.
`graphstore-builder`	674	27	7k	Python adapter authors. Imports graphstore as a library.

Each drops content the other audience doesn't need. Combined they still cost less per-session than the old mega-skill, because only one loads per use case.

graphstore-dsl covers

• Grammar reference (every verb + clause order)
• WHERE / MATCH / BATCH syntax
• String escape rules (`\"` inside literals)
• Value types (str/num/NULL/NaN/time)
• Reserved fields (`event_at`, `confidence`, etc.)
• Gotchas G1-G12 (DSL-relevant subset)
• Emission patterns: conversational ingest, belief extraction, query generation

graphstore-builder covers

• Every `q.*` function with signature + DSL emission
• `F` predicate algebra (eq, ne, gt, in_, contains, similar_score, etc.)
• `P` pattern builder for MATCH
• `agg` + `HavingExpr` comparisons
• `Time` / `TimeExpr`
• `EvolveWhen` / `EvolveThen`
• Plugin registration (`register_verb`)
• Composition (`|`, `.pipe`, `.with_`, `.limit`, `.where`)
• Patterns A-F end-to-end in typed builder calls
• Debug checklist

Verified against codebase

• Every `q.` signature matches `src/graphstore/query/verbs/.py`
• Config defaults match `src/graphstore/config.py`: `remember_weights=[0.52, 0.25, 0.15, 0.08]`, `recency_half_life_days=7300.0`, `graph_signal_enabled=True`, `fusion_method="weighted"`, `nucleus_expansion=False`
• `P.node().to(P.var(), edge=F.eq(...))`, `q.sys.evolve.rule(when=[W.cond(...)], then=[A.run(...)])`, `q.aggregate_nodes(having=agg.count()>=10)` all dry-run through `.venv` and emit valid DSL

Other changes

• `benchmarks/framework/adapters/graphstore_.py` docstring now points at `graphstore-builder` (adapter uses the Python API).

Em dash sweep

Zero em dashes in either new file (Rule 9).

Removed

`tools/skills/graphstore-ingestion/` - old skill removed.