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gsxdsm 47e7b4a150 FN-6704: capture merge LOC for productivity analytics

Capture merge-time diff stats so Command Center Productivity can report real Lines changed when available.

- Add nullable additions/deletions columns to task commit associations with migration and storage normalization.
- Persist git shortstat counts from merge association paths without blocking merges when stats are unavailable.
- Aggregate Productivity LOC from recorded commit stats while preserving the unavailable sentinel for historical unknowns.
- Cover migration, store upsert, analytics, and merger association stats behavior with tests and documentation.

Files changed:
 .changeset/fn-6704-command-center-loc.md           |  5 ++
 docs/architecture.md                               |  4 +-
 docs/storage.md                                    |  3 +
 packages/core/src/__tests__/db-migrate.test.ts     | 32 ++++----
 packages/core/src/__tests__/db.test.ts             | 90 ++++++++++++++++------
 .../src/__tests__/productivity-analytics.test.ts   | 47 +++++++++--
 packages/core/src/__tests__/store-upsert.test.ts   | 40 ++++++++++
 packages/core/src/db.ts                            | 14 +++-
 packages/core/src/productivity-analytics.ts        | 56 +++++++++-----
 packages/core/src/store.ts                         | 17 +++-
 packages/core/src/task-lineage.ts                  |  2 +
 packages/core/src/types.ts                         |  2 +
 .../merger-commit-association-stats.test.ts        | 90 ++++++++++++++++++++++
 packages/engine/src/merger-ai.ts                   |  2 +
 packages/engine/src/merger.ts                      | 17 +++-
 15 files changed, 349 insertions(+), 72 deletions(-)

Fusion-Task-Id: FN-6704

Fusion-Task-Lineage: f079fecb-eade-4318-bc55-23aa48097b4a

2026-06-19 06:51:57 -07:00