feat(project-bootstrap): canonical template + Step 5.6 add session-handoff trigger [v1.12.0]

CLAUDE.md.template gains `session handoff: read on start, write on end`
between `pull remote before work` and `follow project discipline`
(session-lifecycle clustering). Step 5.6 trigger->fulfiller table gains
the corresponding row (template ↔ table source-of-truth invariant).

Greenfield-bootstrap'ed projects now ship handoff trigger из коробки.
Existing projects unaffected — CLAUDE.md merge in Step 5 is idempotent
and respects user removals.

Bump 1.11.0 -> 1.12.0 MINOR (new canonical trigger = new capability,
backward-compatible). dist/project-bootstrap.skill rebuilt.

Closes [session-handoff-bootstrap-template-extend].
Unblocks [session-handoff-existing-projects-upgrade] Path B.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

skills/project-bootstrap/SKILL.md

@@ -1,6 +1,6 @@
 ---
 name: project-bootstrap
-version: 1.11.0
+version: 1.12.0
 description: >
   Initializes or upgrades a project in the current folder: git, .gitignore, README.md,
   .wiki/ using Karpathy's method, .tasks/ for task tracking, CLAUDE.md with skill triggers.
@@ -489,6 +489,7 @@ Mismatch between template and map → silent gaps in the recommendation.
 | `use task management system` | `using-tasks` | skill | `~/.claude/skills/using-tasks/SKILL.md` | `bash scripts/install.sh using-tasks` |
 | `check across all projects` | `using-projects-meta` | skill | `~/.claude/skills/using-projects-meta/SKILL.md` | `bash scripts/install.sh using-projects-meta` |
 | `pull remote before work` | `pulling-before-work` | skill | `~/.claude/skills/pulling-before-work/SKILL.md` | `bash scripts/install.sh pulling-before-work` |
+| `session handoff: read on start, write on end` | `session-handoff` | skill | `~/.claude/skills/session-handoff/SKILL.md` | `bash scripts/install.sh session-handoff` |
 | `follow project discipline` | `project-discipline` | skill | `~/.claude/skills/project-discipline/SKILL.md` | `bash scripts/install.sh project-discipline` |
 | `follow tdd-criteria` | `tdd-criteria` | skill | `~/.claude/skills/tdd-criteria/SKILL.md` | `bash scripts/install.sh tdd-criteria` |
 | `delegate to interns when allowed` | `using-interns` | skill | `~/.claude/skills/using-interns/SKILL.md` | `bash scripts/install.sh using-interns` |

skills/project-bootstrap/assets/CLAUDE.md.template

@@ -7,6 +7,7 @@ use project wiki
 use task management system
 check across all projects
 pull remote before work
+session handoff: read on start, write on end
 follow project discipline
 follow tdd-criteria
 delegate to interns when allowed