feat: report measured time, drop the nominal-day fit

Splitting a fixed 8h day by share turned 160 minutes of Friday morning
into "7h Tesser". The number looked measured and was not, and no column
in the table said which.

Cells now carry the time each project was actually active. The total
column is wall-clock presence — the union of active slots — so it reads
lower than the row sum when sessions overlapped. Measured time is a
floor; the skill says so and leaves adding the rest to the user.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

README.md

@@ -113,7 +113,7 @@ Drop a new `skills/<name>/SKILL.md` (+ optional `scripts/`, `references/`, `asse
 | `nightshift` | hours-long unattended build; architect delegating to subagents, backs off before the 5h limit |
 | `linear-common` | shared config/setup/worktree conventions + local verification budget (dependency of work/yolo/blitz/nightshift) |
 | `week-review` | review the past week's sessions for recurring friction; reads open issues here as carry-over |
-| `hourlog` | hours-per-project-per-day proposal from session activity, reconciled against the timesheet; submits only what you approve |
+| `hourlog` | measured active time per project per day from session transcripts, reconciled against the timesheet; submits only what you approve |
 | `crit`, `improve-codebase-architecture` | misc |
 
 ## Vendored skills