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

docs/prds/0066-separate-agent-bottle-selection.md

@@ -37,7 +37,7 @@ egress policy), the operator must duplicate the agent file and change the
    selection order, as the effective bottle for the session.
 5. Confirming with an empty selection falls back to the agent's `bottle:` field.
    If neither is set, a ManifestError is raised pointing the operator at the fix.
-6. The ordered bottle list is stored in launch metadata so `./cli.py resume`
+6. The ordered bottle list is stored in launch metadata so `bot-bottle resume`
    uses the same bottles.
 7. The preflight summary (`y/N` screen) shows the effective bottle name(s).
 8. The multi-select picker supports incremental filtering, Space/Enter to toggle
@@ -52,7 +52,7 @@ egress policy), the operator must duplicate the agent file and change the
 - Reordering the selection list from within the picker (order = insertion order;
   drag-and-drop is out of scope).
 - Storing bottle selection history / MRU.
-- Changes to `./cli.py edit`, `./cli.py list`, or `./cli.py info`.
+- Changes to `bot-bottle edit`, `bot-bottle list`, or `bot-bottle info`.
 - Removing the `bottle:` key from the agent schema (it stays, now optional).
 
 ## Design