feat: Squad-inspired persistent state, routing reference, and formal parallel execution protocol

[Copilot]

Studied bradygaster/squad for applicable patterns. Key gaps identified: no persistent team knowledge store, and the parallel execution model in the orchestrator is implicit (3-line hint) rather than structured.

.nowdev/ Persistent State Directory

Analogous to Squad's .squad/ directory. Five markdown files committed to the repo so team knowledge survives sessions and travels with contributors:

File	Purpose
team.md	Full agent roster with file paths and status
routing.md	Request-type → agent mapping + ServiceNow artifact dependency table
decisions.md	Architecture decision log; append-only
wisdom.md	Distilled ServiceNow patterns and anti-patterns
now.md	Current sprint focus

Parallel Execution Protocol

The orchestrator's parallel section was vague. The new protocol in NowDev-AI.agent.md formalizes fan-out/fan-in with explicit steps:

1. Build dependency graph before delegation
2. Announce the plan to the user ("I will run X and Y in parallel, then Z after both complete")
3. Fan-out: call agent tool multiple times in a single response for independent artifacts
4. Fan-in: collect all results before proceeding to review or the next wave

Includes a concrete ServiceNow dependency table (e.g., Script Include → Business Rule referencing it = sequential; multiple Script Includes = parallel) so the orchestrator has deterministic rules rather than guessing.

AGENT-PATTERNS.md gets a new Canonical: Parallel Execution Protocol section with the dependency table, anti-patterns (false sequencing, missing fan-in), and a fan-out diagram.

.gitattributes Merge Drivers

.nowdev/decisions.md merge=union
.nowdev/wisdom.md    merge=union
.nowdev/now.md       merge=union

Append-only state files use union merge so concurrent contributors never conflict.

Not Implemented (Low Feasibility)

• Ralph-style autonomous monitor — requires GitHub automation infrastructure not present here
• Sprint ceremonies — NowDev AI is per-session, not per-sprint; not applicable