Drop the --legacy flag: set_local_db and toggle_index now run
unconditionally instead of only when -l was passed, since that was the
flag's only effect.
Fix set_dot_env writing the connection/RCC_CONNECTION line twice with
opposing polarity (once from the #docker pass, once from the #cidb
pass), which flipped it to the wrong value. Collapsed the three
separate open/read/write passes into one, toggling both sections and
the connection line in a single scan so the connection line is only
ever touched once.
toggle_index ran git checkout on connections.env whenever going
down, discarding whatever set_local_db had just written and
restoring whatever format happens to be committed. This silently
undid the RCC_/legacy dual-format toggle. update-index still marks
the file assume-unchanged/no-assume-unchanged; the checkout is gone.
set_local_db, toggle_after_line and set_dot_env now return a
FileChange (path + before/after line pairs) instead of (), and main
prints it after each toggle so 'up'/'down' shows exactly what the
program rewrote in each env file.
connections.env and local .env are transitioning from dotted keys
(ci.db.master.ip, connection) to upper-cased RCC_-prefixed keys
(RCC_CI_DB_MASTER_IP, RCC_CONNECTION). Both forms are matched and
toggled during the migration, so old branches keep working while
new ones use the new format.
mathias