fix: get_architecture should honor path scope

[linze0721]

Summary

Fix for #604: get_architecture path scoping

Problem

get_architecture ignored the optional path argument and always returned whole-project architecture (same total_nodes / package lists for root vs subdirectory scopes).

Solution (3 commits on branch)

1. Store layer (src/store/store.c, src/store/store.h): Extended cbm_store_get_architecture with optional path (directory prefix on nodes.file_path). Threaded scoping through arch_* builders (languages, file tree, clusters, hotspots, entry points, routes, packages/modules, schema counts). When path is set, responses expose distinct root vs scoped node/edge totals.
2. MCP/CLI (src/mcp/mcp.c): Added path to the get_architecture tool schema; handler parses and forwards path, emits root_total_* / scoped_total_* (and related fields) when scoped.
3. Polish (55058c0): Normalize trailing slashes on path; align MCP path_scoped flag with store behavior.

Tests

• tests/test_store_arch.c: arch_path_scoping (+ trailing-slash equivalence)
• tests/test_mcp.c: tool_get_architecture_path_scoping

Verification

make -j$(nproc) -f Makefile.cbm test: 5695 passed, 1 failed — tests/test_incremental.c RSS threshold (pre-existing, unrelated to #604). Targeted architecture path tests passed.

Push

Branch berserk/fd632085-2b69-4b14-930b-47025d80d973 pushed to origin (HEAD 55058c0).

PR

https://github.com/linze0721/codebase-memory-mcp/pull/new/berserk/fd632085-2b69-4b14-930b-47025d80d973

Commit

55058c0

Branch

berserk/fd632085-2b69-4b14-930b-47025d80d973

Closes #604

[DeusData]

Excellent work, @linze0721 — a thorough fix for #604. get_architecture was ignoring the path argument entirely; threading a scoped file_path predicate through every aspect builder (plus the node/edge/schema counts) is genuinely the right shape for this. I appreciate that it's all parameterized SQL and that the unset-path case falls back to the exact prior queries, so default behavior is fully preserved. The root-vs-scoped totals are a useful addition, and both the store-level and end-to-end MCP tests are reproduce-first. All CI green including Windows + CodeQL. Merging — thank you!