fix(install_cc_hook,session_start_hook,tools): preserve wrapper-level metadata, thread Mcp-Session-Id, add manual slider harness #1254

Job	Run time
core + backends typecheck (Python 3.11)	36s
coverage gate (Python 3.11)	6m 51s
encryption driver gate (Python 3.11)	37s
browser accessibility smoke	4m 57s
build + install wheel	27s
test + lint (full offline stack) (3.12)	5m 1s
core floor (numpy-only, Python 3.9)	4m 25s
repo hygiene gate (no stray DBs/logs)	7s
test + lint (full offline stack) (3.10)	4m 23s
Pi extension (windows-latest, Python 3.11, Node 24)	1m 56s
docker smoke — path gate	8s
test + lint (full offline stack) (3.11)	4m 34s
Pi extension (ubuntu-latest, Python 3.10, Node 22.19.0)	59s
test + lint (full offline stack) (3.13)	4m 46s
test + lint (full offline stack) (3.14)	4m 55s
encryption driver gate (Python 3.12)	24s
encryption driver gate (Python 3.14)	31s
encryption driver gate (Python 3.13)	34s
encryption driver gate (Python 3.10)	33s
docker build + health smoke	2m 1s
	48m 45s

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