* refactor(llamaindex): merge two packages into single hindsight-llamaindex
Merge `llama-index-tools-hindsight` and `llama-index-memory-hindsight` into
a single `hindsight-llamaindex` package following our naming convention.
- Rename package to `hindsight-llamaindex` (Python module: `hindsight_llamaindex`)
- Move HindsightToolSpec and HindsightMemory into the same package
- Delete `llamaindex-memory/` directory
- Add CI test job for llamaindex integration
- Update docs, blog post, and integrations.json
* fix(blog): update llamaindex blog post for merged package
- Move date to 2026-03-30
- Add HindsightMemory (automatic BaseMemory) pattern
- Fix "bank must exist first" pitfall — mission auto-creates
- Align all code examples with docs page
- Update architecture diagram to show both patterns
* fix(docs): add llamaindex/openai icons, rename Codex
- Add llamaindex.png and openai.png icons
- Rename "OpenAI Codex CLI" to "Codex" in integrations.json and docs
- Use openai.png icon for Codex integration
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