docs: name the admin dashboard's domain terms in CONTEXT.md

Charting #114 introduced four terms the glossary did not carry: Orphan
Series (#125), Lane Pass (#117), Forced Poll and Paused Lane (#119).
Acquisition's entry is amended because a Forced Poll now replaces a
Cover (#120), so establishing one is no longer unique to Acquisition.

CONTEXT.md

@@ -110,14 +110,6 @@ reached. Every pause carries an expiry — a Lane cannot be stopped indefinitely
 outlives a restart, being a fact about the Site rather than about the running process.
 _Avoid_: disabled, off, stopped, suspended, kill switch (that is the deploy-time switch)
 
-**Stall**:
-A Poll Lane that owed Polls, made none, and has nothing to say for it. Distinct from the
-two conditions it resembles: a Site that refuses is exercising the pace it is entitled to,
-and a Lane the owner paused was told to stop — a Stall is neither asked for nor explained.
-It is the one fault no Reader surface can show: every Bookmark still opens, Progress still
-syncs, and Latest Chapter is quietly wrong for as long as it lasts.
-_Avoid_: outage, downtime, failure, backlog, lag
-
 **Sighting**:
 What a Reader's browser happened to see of a Series's Latest Chapter while that Reader
 was on the page. It reports the same fact as a Poll but carries none of its authority:
@@ -135,14 +127,6 @@ facts, which no Poll does unless the owner forces one. It happens once in a Seri
 life; every later read of the same page is a Poll.
 _Avoid_: initial poll, first fetch, prefetch, warm-up
 
-**Correction**:
-A Latest Chapter the owner sets by hand, on a Series no Poll can read. It reports the
-same fact as a Poll and carries even less authority than a Sighting: the next Poll
-overwrites it, so does any Reader's Sighting, and it is never a floor or a pin. It
-exists only because the Site page is unreadable — where a Poll can read the page, the
-Poll is the answer and a Correction is not wanted.
-_Avoid_: override, pin, manual value, fix
-
 **New Chapter**:
 The state where Latest Chapter is ahead of Progress. The single condition the ember
 accent is permitted to signal.