feat(ruby): isStatic, attr_accessor synthesis, brace-block calls Prism dispatcher fan-out

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CodeGraph's Ruby support had real gaps an agent hits constantly: def self.x/class << self methods indistinguishable from instance methods, attr_accessor/attr_reader/attr_writer invisible (calls to them resolved
to nothing), brace-block bodies (5.times { beep }) blind to bare-call extraction while do...end wasn't, and Prism-dispatcher visitor architectures (ruby-lsp's core pattern: dispatcher.register(self, :on_x) →
dispatcher.dispatch(...)) had zero dynamic-dispatch bridging — an agent tracing "hover request → handler" had no static path and had to grep every listener file.

Root cause

• isStatic hook never implemented for Ruby in either extractor.
• attr_* calls fell into the importTypes:['call'] funnel (only require/require_relative produce anything).
• Brace-block grammar node (block_body) missing from the bare-call parent set (only body_statement for do...end was there).
• No synthesizer existed for Prism's register/dispatch fan-out — an external-gem-mediated callback with no static call site from dispatch to on_x.

Fix

• Added isStatic to ruby.ts + ruby.rs (singleton_method object field check, class << self parent-chain check).
• Added synthesizeRubyAttrMembers/synthesize_attr_members — getter/setter method nodes for attr_*, wired for both classes and modules (Concern pattern), explicit methods never overridden.
• Added block_body to the allowed-parent set in both extractors.
• New prismDispatchEdges synthesizer in callback-synthesizer.ts: matches register(self, :on_x, ...) symbol lists, resolves listener classes (namespace-suffix aware for Ruby's lexical scoping), follows a two-hop
  Request-wrapper indirection, and handles instance-variable-threaded dispatchers (@dispatcher set in initialize, read in a sibling perform) — while keeping sibling methods with same-named unrelated local
  dispatcher vars from cross-linking.

Validated

• Full suite: 161 files / 2706 tests green.
• kernel-ruby-parity.test.ts green — TS/wasm and Rust kernel byte-identical on all new constructs.
• Indexed real ruby-lsp repo fresh: node count stable (4,987 before/after), 575 synthesized Prism edges, no runaway fan-out (max 101/site vs 400 cap), no cross-contamination.
• codegraph_explore and scripts/agent-eval/probe-explore.mjs against ruby-lsp confirm the target flow (textDocument/hover → Hover#on_call_node_enter) resolves end-to-end with the synthesized edge correctly
  labeled and sited.
• Not run: full agent A/B (run-all.sh, Sonnet, with-vs-without codegraph).

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#648

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@colbymchenry please, review this fix for ruby language support