docs: name bot-bottle, not ./cli.py, in every instruction

`doctor` told users to run `./cli.py backend setup`. cli.py is a four-line
wrapper at the repo root that calls bot_bottle.cli:main, and it does not ship —
[tool.setuptools.packages.find] includes only bot_bottle*, so anyone who
installed rather than cloned has no such file. Confirmed against a real
install: the user's tree contains exactly one executable, `bot-bottle`, and no
cli.py anywhere, while doctor recommended `./cli.py` three times. Invisible in
development, where ./cli.py works fine from a checkout, which is why only a
clean-install test surfaced it.

The two entry points are the same code, so the fix is to name the one that
always exists. 141 replacements across 45 files: the runtime messages that
caused this, plus README, docs, PRDs, research notes and test prose, so nothing
teaches the invocation a user cannot run.

scripts/demo.sh is deliberately untouched — it *executes* ./cli.py from a
checkout, where that is the correct and available path.

Verified end to end: a sandbox install now reports
"Run: bot-bottle backend setup --backend=firecracker", and bot-bottle is on
that user's PATH. Unit suite unchanged against the pre-existing baseline.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WEfZZhakx13bxTfXcZCoS5

bot_bottle/backend/freeze.py

@@ -43,7 +43,7 @@ class Freezer(ABC):
 
         Calls _freeze for the backend-specific snapshot, then writes the
         committed image reference to per-bottle state and marks the bottle
-        preserved so the next `./cli.py resume` boots from the snapshot.
+        preserved so the next `bot-bottle resume` boots from the snapshot.
 
         Raises CommitCancelled if the user declines an interactive
         confirmation prompt (e.g. the macos-container stop prompt).
@@ -51,7 +51,7 @@ class Freezer(ABC):
         image_ref = self._freeze(agent)
         write_committed_image(agent.slug, image_ref)
         mark_preserved(agent.slug)
-        info(f"to resume from this snapshot: ./cli.py resume {agent.slug}")
+        info(f"to resume from this snapshot: bot-bottle resume {agent.slug}")
         self._export_hint(agent.slug, image_ref)
 
     @abstractmethod