sdd: persist plan constraints at setup for closed-plan dispatches

skills/subagent-driven-development/SKILL.md

@@ -133,6 +133,10 @@ a ledger file, not only in todos.
   plan's progress: leave it in place and start your own, fresh.
 - Create the ledger with its identity as the first line:
   `# SDD ledger — plan: <plan file path>`.
+- During that same Setup read, copy the plan's Global Constraints section
+  verbatim into `<workspace>/constraints.md`. The global-constraints block
+  you hand reviewers pastes from that file — the plan itself stays closed
+  after Setup, even across compaction.
 - The ledger is your recovery map: the commits it names exist in git even
   when your context no longer remembers creating them. After compaction,
   trust the ledger and `git log` over your own recollection.
@@ -140,7 +144,11 @@ a ledger file, not only in todos.
   that happens, recover from `git log`.
 
 Read the plan once, note its context and Global Constraints, and create a
-todo per task.
+todo per task. That is the plan's one full read for the whole session:
+after Setup, the ledger and `scripts/task-brief` extracts are your working
+memory — re-reading the plan or spec late in the run (to "double-check"
+completion, to rebuild the final-review dispatch) re-buys context you
+already paid for and is forbidden.
 
 Before dispatching Task 1, scan the plan once for conflicts:
 
@@ -195,7 +203,10 @@ that implementer. Single-file mechanical fixes also take the cheapest tier.
 
 Everything you paste into a dispatch prompt — and everything a subagent
 prints back — stays resident in your context for the rest of the session
-and is re-read on every later turn. Hand artifacts over as files.
+and is re-read on every later turn. Hand artifacts over as files. The same
+tax applies to your own words: checkpoint in one short line, keep
+bookkeeping in the ledger file, and never paste back into the conversation
+what a file already holds.
 
 ### 1. Dispatch the implementer
 
@@ -399,7 +410,10 @@ on the most capable available model (see Model Selection), using
 superpowers:requesting-code-review's
 [code-reviewer.md](../requesting-code-review/code-reviewer.md). Point it at
 the ledger's deferred-minor and parked lines so it can triage which must be
-fixed before merge.
+fixed before merge. Build that dispatch from the ledger alone — the
+completion lines, parked rulings, and deferred minors are the whole-run
+summary; do not re-read the plan, the spec, or per-task reports to
+reconstruct what the ledger already states.
 
 If the final whole-branch review returns findings, dispatch ONE fix subagent
 with the complete findings list — not one fixer per finding.

skills/writing-plans/SKILL.md

@@ -71,7 +71,11 @@ independently testable deliverable.
 [The spec's project-wide requirements — version floors, dependency limits,
 naming and copy rules, platform requirements — one line each, with exact
 values copied verbatim from the spec. Every task's requirements implicitly
-include this section.]
+include this section. Three things may never enter it: cosmetic absolutes
+on every commit (a fixed trailer or byline the work does not need), your
+own identity or model name promoted into a rule, and environment
+constraints (versions, platforms, paths) you have not verified against the
+environment the plan will execute in.]
 
 ---
 ```
@@ -125,6 +129,8 @@ git commit -m "feat: add specific feature"
 ```
 ````
 
+Commit messages describe the change. Never mandate session boilerplate — trailers, bylines, model names — as a per-commit rule; what your session stamps on its commits is not a requirement of the work.
+
 ## No Placeholders
 
 Every step must contain the actual content an engineer needs. These are **plan failures** — never write them:
@@ -145,6 +151,8 @@ After writing the complete plan, look at the spec with fresh eyes and check the
 
 **3. Type consistency:** Do the types, method signatures, and property names you used in later tasks match what you defined in earlier tasks? A function called `clearLayers()` in Task 3 but `clearFullLayers()` in Task 7 is a bug.
 
+**4. Constraint hygiene:** Does any Global Constraint mandate a per-commit cosmetic absolute, name the authoring model or session, or assert an environment fact (version floor, platform, path) you did not verify? Cut or verify it.
+
 If you find issues, fix them inline. No need to re-review — just fix and move on. If you find a spec requirement with no task, add the task.
 
 ## Execution Handoff