Add domain-scenario Gherkin tags to all A2A, session, and CLI feature
files (30 files) so tests can be filtered individually via behave.
- 8 A2A feature files: @a2a tag
- 7 session feature files: @session tag
- 15 CLI feature files: @cli tag
ISSUES CLOSED: #9124
Renames `plan lifecycle-list` to `plan list` and `plan lifecycle-apply` to `plan apply` to align with the specification's canonical command names. Removes legacy V2 plan commands that occupied those names.
- Renamed CLI command registrations from lifecycle-list/lifecycle-apply to list/apply
- Removed legacy V2 apply and list commands (~200 lines)
- Updated apply shortcut in main.py to delegate to v3 lifecycle
- Added defensive null check for plan existence in apply command
- Updated 63+ test, doc, and benchmark files for consistency
Closes#881
Co-authored-by: Jeffrey Phillips Freeman <the@jeffreyfreeman.me>
Co-committed-by: Jeffrey Phillips Freeman <the@jeffreyfreeman.me>
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