fix(cli): stabilize export and outdated status guidance

[sunerpy]

Summary

• sort exported edges by stable semantic fields before centrality/rendering so incremental sync and index --force emit byte-identical JSON
• guide outdated extraction indexes to codegraph sync <project> instead of incorrectly suggesting initialization
• add unit and CLI regressions for both release-smoke failures

Verification

• cargo fmt --all --check
• cargo clippy --workspace --all-targets -- -D warnings
• cargo test --workspace
• bash scripts/guardrail.sh
• make ci
• pre-push gate

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@           Coverage Diff           @@
##             main     #260   +/-   ##
=======================================
  Coverage   95.36%   95.36%           
=======================================
  Files         144      144           
  Lines       84290    84347   +57     
=======================================
+ Hits        80384    80441   +57     
  Misses       3906     3906           

Files with missing lines	Coverage Δ
crates/codegraph-cli/src/main.rs	90.96% <100.00%> (+0.01%)	⬆️
crates/codegraph-graph/src/export.rs	100.00% <100.00%> (ø)

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