Issue #54: Story Craft Essentials learning path

[BryanHarrisScripts]

Closes #54.

Implementation

• adds the Story Craft Essentials Read & Learn collection with nine complete lessons
• maps all seven legacy Essentials sources into the connected learning path and preserves searchable aliases
• teaches the full why → how → evidence → diagnose → revise workflow
• adds a project-connected Story Experience Card for audience promise, emotional movement, genre, tonal range, central question, competing answers, signature element and ending after-effect
• adds a Pacing and Tone Map derived from existing scene duration, pressure, information change, tonal mode, pivot and handoff evidence
• corrects pacing away from genre-speed assumptions and constant-intensity goals
• adds a Theme Argument Map connecting competing answers, characters, Story Threads, choices, consequences, climax proof and ending reflection
• treats theme as a contested question rather than a moral repeated by every element
• adds a Scene Pulse learning overlay for Pressure Lock, Cut Line, Pivot, Value flip and Handoff with plain-language definitions, active evidence, revision experiments and direct field links
• adds a Screen Evidence Translator for action/refusal, changed tactic, objects/blocking, sound/silence, dialogue/subtext, repetition with variation and intentional narration
• corrects visual writing away from internal-thought claims, exhaustive inventories and routine camera direction
• adds a Motif and Echo Ledger for introduction, repetitions, meaning shifts, associations, appearances, payoff/reversal/unresolved ending and continuity
• treats symbolism as context, culture, repetition and change rather than fixed universal meanings
• adds an advanced screenplay formatting toolbox with editable Fountain-style previews for mini-slugs, montage, series of shots, intercutting, remote conversations, V.O./O.S., dual dialogue, inserts, transitions, sections/notes and boneyards
• documents dramatic purpose, readable form, Fountain/FDX/PDF preservation, common misuse and spec/production/internal drafting layer for every format
• adds a searchable fourteen-lens Essential Technique Library covering audience effect, evidence, failure modes and PlotPickle destination
• adds a fourteen-step Essential Craft Audit that records evidence questions, root cause and bounded revision priority rather than a universal score
• adds contextual recommendations based on active Block, mini-block, scene purpose, theme, tone and screenplay state
• adds Story Craft Essentials to Engine Hub
• keeps manual and no-AI workflows complete and all optional AI output non-canonical until explicit approval
• keeps PlotPickle schema 1.7 frozen by using existing review records and computed project evidence
• adds architecture documentation and regression coverage

Validation

• issue-specific integration validation — passed
• npm run lint — passed
• npm test — passed
• PlotPickle Quality — passed
• Phase 1 validation — passed
• Release Candidate packaging — passed on Windows, macOS and Linux
• staged-package verification — passed on all platforms
• clean-machine extraction and dependency verification — passed on Windows, macOS and Linux
• all temporary integration files removed before final validation