docs: move roadmap files into docs/roadmap/

Move BACKLOG.md, ROADMAP.md, and llm-integration.md from docs/ to
docs/roadmap/ for better organization. Update references in README.md,
STABILITY.md, and BACKLOG.md.

Author: github-actions[bot]

README.md

@@ -604,7 +604,7 @@ const { results: fused } = await multiSearchData(
 
 ## 🗺️ Roadmap
 
-See **[ROADMAP.md](ROADMAP.md)** for the full development roadmap and **[STABILITY.md](STABILITY.md)** for the stability policy and versioning guarantees. Current plan:
+See **[ROADMAP.md](docs/roadmap/ROADMAP.md)** for the full development roadmap and **[STABILITY.md](STABILITY.md)** for the stability policy and versioning guarantees. Current plan:
 
 1. ~~**Rust Core**~~ — **Complete** (v1.3.0) — native tree-sitter parsing via napi-rs, parallel multi-core parsing, incremental re-parsing, import resolution & cycle detection in Rust
 2. ~~**Foundation Hardening**~~ — **Complete** (v1.4.0) — parser registry, 12-tool MCP server with multi-repo support, test coverage 62%→75%, `apiKeyCommand` secret resolution, global repo registry

STABILITY.md

@@ -1,7 +1,7 @@
 # Stability Policy
 
 > **Status: Anticipated — not yet active.**
-> This policy describes the stability guarantees codegraph *will* provide once the public API surface stabilizes after [Phase 3 — Architectural Refactoring](ROADMAP.md). Until then, breaking changes may still land in minor releases as the internal architecture is restructured.
+> This policy describes the stability guarantees codegraph *will* provide once the public API surface stabilizes after [Phase 3 — Architectural Refactoring](docs/roadmap/ROADMAP.md). Until then, breaking changes may still land in minor releases as the internal architecture is restructured.
 
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docs/BACKLOG.md docs/roadmap/BACKLOG.mddocs/BACKLOG.md renamed to docs/roadmap/BACKLOG.md

@@ -1,7 +1,7 @@
 # Codegraph Feature Backlog
 
 **Last updated:** 2026-02-25
-**Source:** Features derived from [COMPETITIVE_ANALYSIS.md](../generated/COMPETITIVE_ANALYSIS.md) and internal roadmap discussions.
+**Source:** Features derived from [COMPETITIVE_ANALYSIS.md](../../generated/COMPETITIVE_ANALYSIS.md) and internal roadmap discussions.
 
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