v0.2: full repurpose — codebase exploration with per-directory cache

BREAKING. memwalk is no longer a personal-activity recorder; it's
an AI tool for asking questions about any codebase, with cached
SSM state per directory.

What's gone
-----------
- sources/git.py, sources/bash.py — personal activity collectors
- snapshot.py — daily snapshot rotation
- ingest.py — orchestration tied to git+bash use case
- standup / update CLI commands
- All v0.1 config keys (scan_paths, bash settings, bootstrap_days)

What's new
----------
- corpus.py        — walk a codebase, filter source files, build a single
                     ingest-ready text block with a stable manifest hash
                     for cache invalidation.
- cache.py         — per-directory cached state + sidecar metadata JSON.
                     Cache key = sha256(abs_path)[:16]; freshness check =
                     manifest hash over (rel_path, size, mtime_ns).
- engine.py        — shared digest/ask orchestration used by both CLI
                     and MCP server.
- cli.py           — init, digest, ask, list, drop, status, mcp.
- mcp_server.py    — tools: digest, ask, list_caches, drop_cache, status.
- config.py        — drastically simplified (just model+inference defaults).

The MCP server still ships as `memwalk mcp` and works the same way with
Claude Code / opencode.

Validated on memwalk's own source: digest in ~4s, ask answers in ~3s
(model+state load) including "list CLI commands", "where is cache
stored, what filename pattern", "how does cache invalidation work" —
all accurate down to specific details (sha256 length, file extensions,
metadata field semantics).

memba dep installed via git URL until both packages reach PyPI.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

pyproject.toml

@@ -4,13 +4,13 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name        = "memwalk"
-version     = "0.1.0"
-description = "Walk through your work memory — semantic recall of git, shell and notes via local SSM models"
+version     = "0.2.0"
+description = "Ask AI about any codebase — local, cached, SSM-state-backed exploration via memba + Nemotron"
 readme      = "README.md"
 license     = { text = "MIT" }
 requires-python = ">=3.10"
 
-keywords = ["llm", "memory", "ssm", "mamba", "nemotron", "memba", "personal-ai", "cli"]
+keywords = ["llm", "ssm", "mamba", "nemotron", "memba", "code-search", "mcp", "cli"]
 classifiers = [
     "Development Status :: 3 - Alpha",
     "Environment :: Console",
@@ -24,7 +24,10 @@ classifiers = [
 ]
 
 dependencies = [
-    "memba>=0.1.0",
+    # memba is not on PyPI yet — install from github.
+    # When memba ships to PyPI this becomes `memba>=0.2.0` and memwalk
+    # can itself be published.
+    "memba @ git+https://github.com/emil28092005/Memba.git@main",
     "typer>=0.9.0",
     "rich>=13.0.0",
     "mcp>=1.0.0",