fix(startup): exclude Python cache from script sync and restore script exec bits

From health's handoff: the startup =.ai/scripts/= sync was dragging pytest build artifacts into every consuming project. =rsync -a= copies by disk presence, not git status, so the =__pycache__/= and =.pytest_cache/= that rulesets' own pytest leaves in =claude-templates/.ai/scripts/tests/= rode along to each project's tree even though the root =.gitignore= already keeps them out of rulesets' commits. Phase A's scripts rsync now excludes =__pycache__=, =.pytest_cache=, and =*.pyc=. A project that already received the cache has to remove it once by hand, since =--delete= leaves excluded paths in place. I noted that in the startup doc.

Health also flagged that =inbox-send.py= kept needing a manual chmod. The cause wasn't rsync dropping the bit. Four shebang scripts (=inbox-send.py=, =cj-scan.py=, =cj-remove-block.py=, =eml-view-and-extract-attachments.py=) were committed mode 100644, so rsync faithfully copied the wrong mode. I set the exec bit on all four so the synced copies are runnable.

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