Fix default live room entrypoint

[spytensor]

Summary

Fixes the v0.9.4 product mismatch where plain cr still opened the read-only dashboard first and then fell through to the old REPL. Plain cr now opens the unified live room directly for initialized interactive projects; cr start remains the explicit legacy/direct REPL escape hatch, and cr console remains the read-only dashboard/snapshot inspection surface.

Closes #313

Acceptance Criteria

• Plain cr in an initialized interactive project enters the unified live room directly.
• Plain cr does not print CoreRoom console closed; starting REPL on normal exit.
• Plain cr does not fall through to the old splash/REPL after leaving the live room.
• cr start remains the explicit legacy/direct REPL escape hatch.
• cr console remains the read-only dashboard/snapshot inspection surface.
• cr console --live-room remains accepted as an explicit alias to the same unified room.
• Real PTY dogfood types bare user text and explicit @role text through plain cr.
• README, CHANGELOG, and dogfood docs describe the corrected default path.

Changed Files

• src/main.rs switches the default initialized TTY path from read-only console + REPL fallback to unified live room.
• src/console_tui.rs separates live-room composer hints from read-only dashboard hints.
• scripts/dogfood-v09-user-cases.py now tests typed input through plain cr, not only cr console --live-room.
• Version/docs/images updated for v0.9.5.

Validation

• cargo fmt --all -- --check
• cargo test --all-features --locked --quiet
• cargo clippy --all-targets --all-features --locked -- -D warnings
• cargo build --release --locked
• target/release/cr --version -> cr 0.9.5
• cd npm && npm pack --dry-run --json -> @spytensor/coreroom@0.9.5
• python3 scripts/dogfood-v09-user-cases.py -> DOGFOOD PASS: v0.9 local user-case gate completed

Real PTY Evidence

The dogfood script now opens plain cr in a 160x48 PTY, waits for Composer, types:

validate unified room from plain cr
@reviewer check explicit routing
/exit

It asserts visible CoreRoom, Project, Conversation, Composer, Environment, Roles, queued for @host, explicit @role routing, and rejects CoreRoom console closed; starting REPL plus the old REPL splash hint.

Risk / Rollback

Risk is isolated to interactive default entrypoint behavior. Roll back by reverting this PR; cr start remains the explicit old REPL path throughout.