Add comprehensive workflows for CLI tools usage, coding philosophy, context requirements, file modification, and CodexLens auto hybrid mode

- Introduced a detailed guide for intelligent tools selection strategy, including quick reference, tool specifications, prompt templates, and best practices for CLI execution.
- Established a coding philosophy document outlining core beliefs, simplicity principles, and guidelines for effective coding practices.
- Created context requirements documentation emphasizing the importance of understanding existing patterns and dependencies before implementation.
- Developed a file modification workflow detailing the use of edit_file and write_file MCP tools, along with priority logic for file reading and editing.
- Implemented CodexLens auto hybrid mode, enhancing the CLI with automatic vector embedding generation and default hybrid search mode based on embedding availability.

.claude/workflows/context-requirements.md

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+# Context Requirements
+
+Before implementation, always:
+- Identify 3+ existing similar patterns
+- Map dependencies and integration points
+- Understand testing framework and coding conventions
+
+## Context Gathering
+
+**MANDATORY**: Use `codex_lens` (MCP tool) for all code search and analysis.
+
+### codex_lens (REQUIRED)
+
+**MCP Actions**: `init`, `search`, `search_files` (Advanced ops via CLI: `codexlens --help`)
+
+**Initialize**:
+```
+codex_lens(action="init", path=".")
+```
+- Auto-generates embeddings if `fastembed` installed
+- Skip with `--no-embeddings` flag
+
+**Search** (Auto hybrid mode):
+```
+codex_lens(action="search", query="authentication")
+```
+**Search Files**:
+```
+codex_lens(action="search_files", query="payment")
+```
+
+### read_file (MCP)
+- Read files found by codex_lens
+- Directory traversal with patterns
+- Batch operations
+
+### smart_search
+- Fallback when codex_lens unavailable
+- Small projects (<100 files)
+
+### Exa
+- External APIs, libraries, frameworks
+- Recent documentation beyond knowledge cutoff
+- Public implementation examples