The session's first executor request pays for the prefix every later one
reuses, so the session-wide hit rate mixes "did the cache work once warm"
with "how much a cold start could reuse". usagereport already records the
cold start, but nothing a live session reads projected it.
The live figures come from the serve ledger, which restarts on /new,
/resume and /fork; usageTally does not, so its ColdStart can belong to an
earlier conversation in the same process. The broadcaster therefore takes
the cold start from the ledger's own population: the first request the
ledger files under the executor (pricing.LedgerSource, the rule Add
already used), split by the same CacheSplit the ledger applies, and reset
with it. SessionUsage carries it as coldStart.
- /status (TUI): "warm cache" row, ledger hit rate with the cold start
taken out of hit, miss and unknown; "out/in" row, output ÷ input.
- Desktop session overview behind the cache meter: the same two figures,
computed in state/overview beside cacheRate.
- wire-parity: ColdStartUsage mirrored in port/session.ts.
In 1.x, "/resume <n>" switches straight to the nth saved session. The Studio
TUI ignored the number and always opened the picker, the known gap left in
the CLI migration tracking issue.
An indexed /resume now resolves the session by its row in the same list the
picker numbers and resumes it, with the same refusals the picker gives: a
running turn, the session already open, or an index outside the list. A bare
/resume (or a non-numeric argument) still opens the picker.
The index lookup shared by /takeover <n> and /rename <n> <title> moves into
one helper so the three commands cannot drift apart.
Refs #11493
The Studio terminal UI answers the 1.x commands that read or steer the
kernel's own state, with 1.x argument shapes and output. Queue verbs and
steer go through the existing inbox routes, so the controller still owns
admission and ordering. /export is a controller capability: the file is
created exclusively and never through a symlink. /takeover resumes the
target without taking a session from another process.
yhh